diff --git a/.dockerignore b/.dockerignore
new file mode 100644
index 0000000..f91b25d
--- /dev/null
+++ b/.dockerignore
@@ -0,0 +1,10 @@
+.git
+backend
+frontend/node_modules
+frontend/dist
+frontend/.svelte-kit
+**/.DS_Store
+*.md
+!deploy/README.md
+.audit
+docs/archive
diff --git a/deploy/nginx-m1.conf b/deploy/nginx-m1.conf
new file mode 100644
index 0000000..3334c98
--- /dev/null
+++ b/deploy/nginx-m1.conf
@@ -0,0 +1,17 @@
+server {
+    listen 80;
+    server_name _;
+    root /usr/share/nginx/html;
+    index index.html;
+
+    # SPA: fall back to index.html for any path
+    location / {
+        try_files $uri $uri/ /index.html;
+    }
+
+    location ~* \.(js|css|png|jpg|jpeg|svg|woff2?)$ {
+        expires 7d;
+        add_header Cache-Control "public";
+        try_files $uri =404;
+    }
+}
diff --git a/frontend/Dockerfile b/frontend/Dockerfile
new file mode 100644
index 0000000..321b6ac
--- /dev/null
+++ b/frontend/Dockerfile
@@ -0,0 +1,13 @@
+# Build the static app, then serve only the built artifacts.
+# Build context is the repo root: `docker build -f frontend/Dockerfile .`
+FROM node:20-slim AS build
+WORKDIR /app
+COPY frontend/package.json frontend/package-lock.json* ./
+RUN npm install --no-audit --no-fund
+COPY frontend/ ./
+RUN npm run build
+
+FROM nginx:1.27-alpine
+COPY deploy/nginx-m1.conf /etc/nginx/conf.d/default.conf
+COPY --from=build /app/dist /usr/share/nginx/html
+EXPOSE 80
diff --git a/frontend/index.html b/frontend/index.html
new file mode 100644
index 0000000..7112963
--- /dev/null
+++ b/frontend/index.html
@@ -0,0 +1,16 @@
+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no" />
+    <title>SlabUploader — Capture</title>
+    <style>
+      html, body { margin: 0; padding: 0; background: #111; }
+      #app { display: block; }
+    </style>
+  </head>
+  <body>
+    <div id="app"></div>
+    <script type="module" src="/src/main.ts"></script>
+  </body>
+</html>
diff --git a/frontend/package-lock.json b/frontend/package-lock.json
new file mode 100644
index 0000000..2210fc1
--- /dev/null
+++ b/frontend/package-lock.json
@@ -0,0 +1,1520 @@
+{
+  "name": "slabuploader-frontend",
+  "version": "0.1.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "slabuploader-frontend",
+      "version": "0.1.0",
+      "dependencies": {
+        "idb-keyval": "^6.3.0",
+        "svelte": "^4.2.20"
+      },
+      "devDependencies": {
+        "@sveltejs/vite-plugin-svelte": "^3.1.2",
+        "svelte-preprocess": "^5.1.4",
+        "typescript": "^5.7.3",
+        "vite": "^5.4.19"
+      }
+    },
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+        "@jridgewell/gen-mapping": "^0.3.5",
+        "@jridgewell/trace-mapping": "^0.3.24"
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diff --git a/frontend/package.json b/frontend/package.json
new file mode 100644
index 0000000..1bcb736
--- /dev/null
+++ b/frontend/package.json
@@ -0,0 +1,21 @@
+{
+  "name": "slabuploader-frontend",
+  "version": "0.1.0",
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "build": "tsc --noEmit && vite build",
+    "preview": "vite preview"
+  },
+  "dependencies": {
+    "idb-keyval": "^6.3.0",
+    "svelte": "^4.2.20"
+  },
+  "devDependencies": {
+    "@sveltejs/vite-plugin-svelte": "^3.1.2",
+    "svelte-preprocess": "^5.1.4",
+    "typescript": "^5.7.3",
+    "vite": "^5.4.19"
+  }
+}
diff --git a/frontend/src/App.svelte b/frontend/src/App.svelte
new file mode 100644
index 0000000..21f787c
--- /dev/null
+++ b/frontend/src/App.svelte
@@ -0,0 +1,94 @@
+<script lang="ts">
+  import { onMount, onDestroy } from 'svelte';
+  import { supported } from './browser';
+  import { createCaptureSession, type CaptureSession } from './capture/session';
+  import type { Capture } from './capture/capture.types';
+  import Resume from './capture/Resume.svelte';
+  import AddPhoto from './capture/AddPhoto.svelte';
+  import MaskPanel from './capture/MaskPanel.svelte';
+  import AxisPanel from './capture/AxisPanel.svelte';
+  import MeasurePanel from './capture/MeasurePanel.svelte';
+
+  const gate = typeof window !== 'undefined' ? supported() : 'window unavailable';
+  const session: CaptureSession = createCaptureSession();
+
+  let cap: Capture = { k: 'addPhoto' };
+  let busy = false;
+  let pngUrl: string | null = null;
+
+  const unsubCap = session.capture.subscribe((c) => {
+    cap = c;
+    pngUrl = c.k === 'measure' ? session.getInventoryUrl() : null;
+  });
+  const unsubBusy = session.busy.subscribe((b) => {
+    busy = b;
+  });
+
+  const pick = (f: File) => void session.addPhoto(f);
+
+  onMount(() => {
+    void session.resumeProbe();
+  });
+  onDestroy(() => {
+    unsubCap();
+    unsubBusy();
+    session.dispose();
+  });
+</script>
+
+{#if gate}
+  <main class="hardstop">
+    <h1>Unsupported browser</h1>
+    <p>
+      SlabUploader needs a modern browser with canvas, workers, and IndexedDB support:
+      iOS Safari, Android Chrome, or desktop Chrome, Edge, or Firefox.
+    </p>
+    <p class="detail">Missing: {gate}</p>
+  </main>
+{:else}
+  <main class="app">
+    {#if cap.k === 'resume'}
+      <Resume onContinue={() => session.continueDraft()} onFresh={() => void session.startFresh()} />
+    {:else if cap.k === 'addPhoto'}
+      <AddPhoto onPicked={pick} />
+    {:else if cap.k === 'mask'}
+      <MaskPanel
+        state={cap}
+        {busy}
+        setSensitivity={session.setSensitivity}
+        setSheet={session.setSheet}
+        approveMask={session.approveMask}
+        retakes={session.retakes}
+        back={session.back}
+      />
+    {:else if cap.k === 'axis'}
+      <AxisPanel
+        state={cap}
+        rotateAxis={session.rotateAxis}
+        approveAxis={session.approveAxis}
+        back={session.back}
+      />
+    {:else}
+      <MeasurePanel
+        state={cap}
+        setLength={session.setLength}
+        setThickness={session.setThickness}
+        calculate={session.calculate}
+        back={session.back}
+        {pngUrl}
+      />
+    {/if}
+  </main>
+{/if}
+
+<style>
+  :global(body) {
+    margin: 0;
+    background: #121212;
+    font-family: system-ui, -apple-system, Segoe UI, sans-serif;
+  }
+  .app, .hardstop { max-width: 720px; margin: 0 auto; min-height: 100vh; }
+  .hardstop { padding: 48px 24px; color: #eee; text-align: center; }
+  .hardstop h1 { font-size: 1.6rem; }
+  .detail { color: #888; font-size: 0.85rem; }
+</style>
diff --git a/frontend/src/browser.ts b/frontend/src/browser.ts
new file mode 100644
index 0000000..b6f73d6
--- /dev/null
+++ b/frontend/src/browser.ts
@@ -0,0 +1,26 @@
+// Supported clients: iOS Safari, Android Chrome, PC Chrome/Edge/Firefox.
+// Gated on required API presence; anything missing → hard stop.
+export function supported(): string | null {
+  if (typeof window === 'undefined') return 'window unavailable';
+  if (typeof createImageBitmap !== 'function') return 'createImageBitmap';
+  if (typeof Worker === 'undefined') return 'Worker';
+  if (typeof indexedDB === 'undefined') return 'IndexedDB';
+  const hasOffscreen =
+    typeof OffscreenCanvas !== 'undefined' &&
+    typeof OffscreenCanvas.prototype.convertToBlob === 'function';
+  const hasCanvasBlob =
+    typeof HTMLCanvasElement !== 'undefined' &&
+    typeof HTMLCanvasElement.prototype.toBlob === 'function';
+  if (!hasOffscreen && !hasCanvasBlob) return 'canvas PNG encode';
+  const ua = navigator.userAgent;
+  const isIOS = /iPad|iPhone|iPod/.test(ua) || (navigator.platform === 'MacIntel' && navigator.maxTouchPoints > 1);
+  const isAndroid = /Android/i.test(ua);
+  const isSafari = /Safari/i.test(ua) && !/Chrome|CriOS|Edg|Firefox|FxiOS/i.test(ua);
+  const isChrome = /Chrome|CriOS/i.test(ua) && !/Edg/i.test(ua);
+  const isEdge = /Edg/i.test(ua);
+  const isFirefox = /Firefox|FxiOS/i.test(ua);
+  if (isIOS && isSafari) return null;
+  if (isAndroid && isChrome) return null;
+  if (!isIOS && !isAndroid && (isChrome || isEdge || isFirefox)) return null;
+  return 'unsupported browser';
+}
diff --git a/frontend/src/capture/AddPhoto.svelte b/frontend/src/capture/AddPhoto.svelte
new file mode 100644
index 0000000..176a1d8
--- /dev/null
+++ b/frontend/src/capture/AddPhoto.svelte
@@ -0,0 +1,31 @@
+<script lang="ts">
+  export let onPicked: (f: File) => void;
+  let file: HTMLInputElement | undefined;
+
+  const pick = (e: Event) => {
+    const f = (e.target as HTMLInputElement).files?.[0];
+    if (f) onPicked(f);
+  };
+</script>
+
+<section class="panel">
+  <h1>Add photo</h1>
+  <ul class="setup">
+    <li>Sheet is green or black, fills the frame around the slab.</li>
+    <li>Slab fully on the sheet, nothing on top of it.</li>
+    <li>Top-down, lens parallel to the face.</li>
+    <li>Slab length along the long side of the picture.</li>
+  </ul>
+  <input type="file" accept="image/*" capture="environment" bind:this={file} on:change={pick} />
+</section>
+
+<style>
+  .panel { padding: 24px 16px; color: #eee; }
+  h1 { font-size: 1.4rem; }
+  .setup { color: #bbb; line-height: 1.6; font-size: 0.95rem; }
+  input[type='file'] { width: 100%; margin-top: 20px; color: #eee; }
+  input[type='file']::file-selector-button {
+    background: #00e5ff; color: #002; border: 0; border-radius: 8px;
+    padding: 12px 20px; font-size: 1rem; font-weight: 600;
+  }
+</style>
diff --git a/frontend/src/capture/AxisPanel.svelte b/frontend/src/capture/AxisPanel.svelte
new file mode 100644
index 0000000..a94272f
--- /dev/null
+++ b/frontend/src/capture/AxisPanel.svelte
@@ -0,0 +1,32 @@
+<script lang="ts">
+  import type { Capture } from './capture.types';
+  import PhotoStage from './PhotoStage.svelte';
+
+  export let state: Extract<Capture, { k: 'axis' }>;
+  export let rotateAxis: () => void;
+  export let approveAxis: () => void;
+  export let back: () => void;
+</script>
+
+<section class="panel">
+  <h1>Length axis</h1>
+  <p class="hint">The arrow points along the slab length. If it does not follow the slab, flip it.</p>
+  <PhotoStage blob={state.source.blob} bbox={state.approvedMask.bbox} heading={state.heading} />
+  <div class="row">
+    <button type="button" class="ghost" on:click={back}>Back</button>
+    <button type="button" class="primary" on:click={rotateAxis}>Flip 180°</button>
+    <button type="button" class="primary" on:click={approveAxis}>Approve axis</button>
+  </div>
+</section>
+
+<style>
+  .panel { padding: 16px; color: #eee; }
+  h1 { font-size: 1.3rem; margin: 0 0 8px; }
+  .hint { color: #aaa; font-size: 0.9rem; margin: 0 0 12px; }
+  .row { display: flex; gap: 10px; margin-top: 16px; }
+  .primary {
+    flex: 1; padding: 14px; font-size: 1rem; border-radius: 10px; border: 0;
+    background: #00e5ff; color: #002; font-weight: 700;
+  }
+  .ghost { flex: 0.7; padding: 14px; border-radius: 10px; border: 1px solid #444; background: transparent; color: #ccc; }
+</style>
diff --git a/frontend/src/capture/MaskPanel.svelte b/frontend/src/capture/MaskPanel.svelte
new file mode 100644
index 0000000..452228b
--- /dev/null
+++ b/frontend/src/capture/MaskPanel.svelte
@@ -0,0 +1,93 @@
+<script lang="ts">
+  import type { Capture, Sheet } from './capture.types';
+  import PhotoStage from './PhotoStage.svelte';
+
+  export let state: Extract<Capture, { k: 'mask' }>;
+  export let busy: boolean;
+  export let setSensitivity: (n: number) => void;
+  export let setSheet: (s: Sheet) => void;
+  export let approveMask: () => void;
+  export let retakes: () => void;
+  export let back: () => void;
+
+  const sheets: Sheet[] = ['auto', 'green', 'black'];
+  $: empty = state.overlay !== null && state.overlay.slabPx === 0;
+  $: maskW = state.overlay && state.source.widthPx > 0 ? state.source.widthPx : 0;
+  $: maskH = maskW > 0 && state.overlay ? state.overlay.bitset.length / maskW : 0;
+  $: canApprove = state.overlay !== null && state.overlay.slabPx > 0;
+</script>
+
+<section class="panel">
+  <h1>Mask</h1>
+  <div class="stage-wrap">
+    <PhotoStage
+      blob={state.source.blob}
+      maskBitset={state.overlay?.bitset ?? null}
+      {maskW}
+      {maskH}
+    />
+    {#if busy}<div class="busy">Working…</div>{/if}
+    {#if state.failed}<div class="warn">Mask pass failed. Adjust and retry, or retake the photo.</div>{/if}
+    {#if empty}<div class="warn">No slab pixels in the mask. Adjust sensitivity or retake.</div>{/if}
+  </div>
+
+  <div class="controls">
+    <div class="seg" role="group" aria-label="Sheet">
+      {#each sheets as s (s)}
+        <button type="button" class:active={state.control.sheet === s} on:click={() => setSheet(s)}>
+          {s[0].toUpperCase() + s.slice(1)}
+        </button>
+      {/each}
+    </div>
+    <div class="sens">
+      <button type="button" class="thumb" aria-label="Decrease sensitivity" on:click={() => setSensitivity(state.control.sensitivity - 1)}>−</button>
+      <input
+        type="range" min="0" max="100" step="1"
+        value={state.control.sensitivity}
+        on:input={(e) => setSensitivity(Number(e.currentTarget.value))}
+      />
+      <button type="button" class="thumb" aria-label="Increase sensitivity" on:click={() => setSensitivity(state.control.sensitivity + 1)}>+</button>
+      <span class="val">{state.control.sensitivity}</span>
+    </div>
+  </div>
+
+  <div class="row">
+    <button type="button" class="ghost" on:click={back}>Back</button>
+    <button type="button" class="ghost" on:click={retakes}>Retake</button>
+    <button type="button" class="primary" disabled={!canApprove} on:click={approveMask}>
+      Approve mask
+    </button>
+  </div>
+</section>
+
+<style>
+  .panel { padding: 16px; color: #eee; }
+  h1 { font-size: 1.3rem; margin: 0 0 12px; }
+  .stage-wrap { position: relative; }
+  .busy {
+    position: absolute; top: 8px; right: 8px; background: rgba(0,0,0,0.7);
+    color: #fff; padding: 4px 10px; border-radius: 6px; font-size: 0.85rem;
+  }
+  .warn { color: #ffb4a2; margin-top: 8px; font-size: 0.9rem; }
+  .controls { margin-top: 16px; display: flex; flex-direction: column; gap: 14px; }
+  .seg { display: flex; gap: 8px; }
+  .seg button {
+    flex: 1; padding: 12px; font-size: 1rem; border-radius: 8px;
+    border: 1px solid #444; background: #1d1d1d; color: #ccc;
+  }
+  .seg button.active { background: #00e5ff; color: #002; font-weight: 700; border-color: #00e5ff; }
+  .sens { display: flex; align-items: center; gap: 10px; }
+  .thumb {
+    width: 48px; height: 48px; border-radius: 50%; font-size: 1.6rem;
+    border: 1px solid #444; background: #1d1d1d; color: #eee; flex: none;
+  }
+  input[type='range'] { flex: 1; }
+  .val { min-width: 2.2ch; text-align: right; font-variant-numeric: tabular-nums; }
+  .row { display: flex; gap: 12px; margin-top: 20px; }
+  .primary {
+    flex: 2; padding: 14px; font-size: 1.05rem; border-radius: 10px; border: 0;
+    background: #00e5ff; color: #002; font-weight: 700;
+  }
+  .primary:disabled { background: #333; color: #777; }
+  .ghost { flex: 1; padding: 14px; border-radius: 10px; border: 1px solid #444; background: transparent; color: #ccc; }
+</style>
diff --git a/frontend/src/capture/MeasurePanel.svelte b/frontend/src/capture/MeasurePanel.svelte
new file mode 100644
index 0000000..a8be483
--- /dev/null
+++ b/frontend/src/capture/MeasurePanel.svelte
@@ -0,0 +1,101 @@
+<script lang="ts">
+  import type { Capture } from './capture.types';
+  import { fmtEighths } from './session';
+  import PhotoStage from './PhotoStage.svelte';
+
+  export let state: Extract<Capture, { k: 'measure' }>;
+  export let setLength: (e: number) => void;
+  export let setThickness: (e: number) => void;
+  export let calculate: () => Promise<void>;
+  export let back: () => void;
+  export let pngUrl: string | null;
+
+  let calcBusy = false;
+  const doCalc = async () => {
+    calcBusy = true;
+    try { await calculate(); } finally { calcBusy = false; }
+  };
+</script>
+
+<section class="panel">
+  <h1>Measure</h1>
+  <PhotoStage blob={state.source.blob} bbox={state.axis.bbox} heading={state.axis.heading} />
+
+  <div class="fields">
+    <div class="field">
+      <span class="label">Length L</span>
+      <div class="stepper">
+        <button type="button" class="thumb" on:click={() => setLength(state.lengthEighths - 1)} aria-label="Length minus">−</button>
+        <span class="v">{fmtEighths(state.lengthEighths)}</span>
+        <button type="button" class="thumb" on:click={() => setLength(state.lengthEighths + 1)} aria-label="Length plus">+</button>
+      </div>
+    </div>
+    <div class="field">
+      <span class="label">Thickness</span>
+      <div class="stepper">
+        <button type="button" class="thumb" on:click={() => setThickness(state.thicknessEighths - 1)} aria-label="Thickness minus">−</button>
+        <span class="v">{fmtEighths(state.thicknessEighths)}</span>
+        <button type="button" class="thumb" on:click={() => setThickness(state.thicknessEighths + 1)} aria-label="Thickness plus">+</button>
+      </div>
+    </div>
+  </div>
+
+  <div class="row">
+    <button type="button" class="ghost" on:click={back}>Back</button>
+    <button
+      type="button"
+      class="primary"
+      disabled={calcBusy || state.lengthEighths === 0 || state.thicknessEighths === 0}
+      on:click={doCalc}
+    >
+      {calcBusy ? 'Calculating…' : 'Calculate'}
+    </button>
+  </div>
+
+  {#if state.results}
+    <div class="results">
+      <div class="nums">
+        <div><span>Widths</span><span>{fmtEighths(state.results.widths.min)} – {fmtEighths(state.results.widths.max)} (avg {fmtEighths(state.results.widths.avg)})</span></div>
+        <div><span>Sqft</span><span>{state.results.sqft.toFixed(2)}</span></div>
+        <div><span>Bdft</span><span>{state.results.bdft.toFixed(2)}</span></div>
+        <div><span>Scale</span><span>{state.results.scale.toFixed(2)} px/in</span></div>
+      </div>
+      {#if state.results.sourceBelowFloor}
+        <div class="warn">Source is below the 1600px floor for the inventory PNG. Retake a larger photo.</div>
+      {/if}
+      {#if pngUrl && !state.results.sourceBelowFloor}
+        <div class="png-wrap">
+          <img src={pngUrl} alt="Inventory PNG" />
+        </div>
+      {/if}
+    </div>
+  {/if}
+</section>
+
+<style>
+  .panel { padding: 16px; color: #eee; }
+  h1 { font-size: 1.3rem; margin: 0 0 12px; }
+  .fields { display: flex; gap: 16px; margin-top: 16px; }
+  .field { flex: 1; }
+  .label { display: block; font-size: 0.9rem; color: #aaa; margin-bottom: 8px; }
+  .stepper { display: flex; align-items: center; gap: 12px; }
+  .thumb {
+    width: 52px; height: 52px; border-radius: 50%; font-size: 1.7rem;
+    border: 1px solid #444; background: #1d1d1d; color: #eee; flex: none;
+  }
+  .v { flex: 1; text-align: center; font-size: 1.15rem; font-variant-numeric: tabular-nums; }
+  .row { display: flex; gap: 10px; margin-top: 20px; }
+  .primary {
+    flex: 2; padding: 14px; font-size: 1.05rem; border-radius: 10px; border: 0;
+    background: #00e5ff; color: #002; font-weight: 700;
+  }
+  .primary:disabled { background: #333; color: #777; }
+  .ghost { flex: 1; padding: 14px; border-radius: 10px; border: 1px solid #444; background: transparent; color: #ccc; }
+  .results { margin-top: 20px; }
+  .nums { display: flex; flex-direction: column; gap: 8px; }
+  .nums div { display: flex; justify-content: space-between; border-bottom: 1px solid #2a2a2a; padding-bottom: 6px; }
+  .nums span:first-child { color: #aaa; }
+  .warn { color: #ffb4a2; margin-top: 12px; font-size: 0.9rem; }
+  .png-wrap { margin-top: 16px; text-align: center; background-image: linear-gradient(45deg,#ccc 25%,transparent 25%),linear-gradient(-45deg,#ccc 25%,transparent 25%),linear-gradient(45deg,transparent 75%,#ccc 75%),linear-gradient(-45deg,transparent 75%,#ccc 75%); background-size: 16px 16px; background-position: 0 0,0 8px,8px -8px,-8px 0; background-color: #eee; border-radius: 8px; padding: 8px; }
+  .png-wrap img { max-width: 100%; border-radius: 4px; }
+</style>
diff --git a/frontend/src/capture/PhotoStage.svelte b/frontend/src/capture/PhotoStage.svelte
new file mode 100644
index 0000000..4104181
--- /dev/null
+++ b/frontend/src/capture/PhotoStage.svelte
@@ -0,0 +1,113 @@
+<script lang="ts">
+  import { onDestroy, tick } from 'svelte';
+  import type { BBox } from './capture.types';
+
+  // Display-only: renders the photo fitted to device width (height capped) plus
+  // one overlay layer. All math lives on source pixels, not this canvas.
+  export let blob: Blob;
+  export let maxH = 420;
+  export let bbox: BBox | null = null;
+  export let heading: 1 | -1 = 1;
+  export let maskBitset: Uint8Array | null = null;
+  export let maskW = 0;
+  export let maskH = 0;
+
+  let url: string | null = null;
+  let canvas: HTMLCanvasElement | undefined;
+
+  const setBlobUrl = (b: Blob) => {
+    if (url) URL.revokeObjectURL(url);
+    url = URL.createObjectURL(b);
+  };
+
+  $: if (blob) setBlobUrl(blob);
+
+  const redraw = () => {
+    if (!url || !canvas) return;
+    const img = new Image();
+    img.onload = () => {
+      if (!canvas) return;
+      const fitW = canvas.parentElement?.clientWidth || canvas.clientWidth || 320;
+      const fitH = Math.min(maxH, (img.height / img.width) * fitW);
+      canvas.width = img.width;
+      canvas.height = img.height;
+      canvas.style.width = `${fitW}px`;
+      canvas.style.height = `${fitH}px`;
+      const ctx = canvas.getContext('2d')!;
+      ctx.clearRect(0, 0, canvas.width, canvas.height);
+      ctx.drawImage(img, 0, 0);
+      if (maskBitset && maskW > 0 && maskH > 0) {
+        const off = document.createElement('canvas');
+        off.width = maskW;
+        off.height = maskH;
+        const octx = off.getContext('2d')!;
+        const d = octx.createImageData(maskW, maskH);
+        const tile = 8;
+        for (let p = 0; p < maskW * maskH; p++) {
+          if (!maskBitset[p]) {
+            const x = p % maskW;
+            const y = (p / maskW) | 0;
+            const light = ((x / tile) | 0) % 2 === ((y / tile) | 0) % 2;
+            d.data[p * 4] = light ? 220 : 180;
+            d.data[p * 4 + 1] = light ? 220 : 180;
+            d.data[p * 4 + 2] = light ? 220 : 180;
+            d.data[p * 4 + 3] = 220;
+          }
+        }
+        octx.putImageData(d, 0, 0);
+        ctx.drawImage(off, 0, 0, canvas.width, canvas.height);
+      }
+      if (bbox && bbox.corners.length === 4) {
+        const c = bbox.corners;
+        ctx.strokeStyle = '#00e5ff';
+        ctx.lineWidth = Math.max(2, canvas.width / 400);
+        ctx.beginPath();
+        ctx.moveTo(c[0][0], c[0][1]);
+        for (let i = 1; i < 4; i++) ctx.lineTo(c[i][0], c[i][1]);
+        ctx.closePath();
+        ctx.stroke();
+        const a = heading === 1 ? c[1] : c[0];
+        const b = heading === 1 ? c[0] : c[1];
+        ctx.strokeStyle = '#ff3d71';
+        ctx.lineWidth = Math.max(3, canvas.width / 300);
+        ctx.beginPath();
+        ctx.moveTo(a[0], a[1]);
+        ctx.lineTo(b[0], b[1]);
+        ctx.stroke();
+        ctx.fillStyle = '#ff3d71';
+        ctx.beginPath();
+        const ang = Math.atan2(b[1] - a[1], b[0] - a[0]);
+        const r = Math.max(10, canvas.width / 60);
+        ctx.moveTo(b[0], b[1]);
+        ctx.lineTo(b[0] - r * Math.cos(ang - 0.4), b[1] - r * Math.sin(ang - 0.4));
+        ctx.lineTo(b[0] - r * Math.cos(ang + 0.4), b[1] - r * Math.sin(ang + 0.4));
+        ctx.closePath();
+        ctx.fill();
+      }
+    };
+    img.src = url;
+  };
+
+  $: if (url || bbox || heading || maskBitset) void tick().then(redraw);
+
+  const onResize = () => redraw();
+  if (typeof window !== 'undefined') window.addEventListener('resize', onResize);
+  onDestroy(() => {
+    if (typeof window !== 'undefined') window.removeEventListener('resize', onResize);
+    if (url) URL.revokeObjectURL(url);
+  });
+</script>
+
+<div class="stage">
+  {#if url}
+    <canvas bind:this={canvas}></canvas>
+  {:else}
+    <div class="loading">Decoding photo…</div>
+  {/if}
+</div>
+
+<style>
+  .stage { width: 100%; display: flex; justify-content: center; }
+  canvas { max-width: 100%; border-radius: 8px; background: #222; }
+  .loading { padding: 40px; color: #999; }
+</style>
diff --git a/frontend/src/capture/Resume.svelte b/frontend/src/capture/Resume.svelte
new file mode 100644
index 0000000..405de66
--- /dev/null
+++ b/frontend/src/capture/Resume.svelte
@@ -0,0 +1,28 @@
+<script lang="ts">
+  export let onContinue: () => void;
+  export let onFresh: () => void;
+</script>
+
+<section class="panel">
+  <h1>Resume?</h1>
+  <p>You have an in-progress slab on this device.</p>
+  <div class="row">
+    <button class="primary" type="button" on:click={onContinue}>Continue</button>
+    <button class="ghost" type="button" on:click={onFresh}>Start fresh</button>
+  </div>
+</section>
+
+<style>
+  .panel { padding: 24px 16px; text-align: center; color: #eee; }
+  h1 { font-size: 1.4rem; }
+  p { color: #aaa; }
+  .row { display: flex; gap: 12px; justify-content: center; margin-top: 24px; }
+  .primary {
+    flex: 1; max-width: 200px; padding: 14px; font-size: 1.05rem; border-radius: 10px; border: 0;
+    background: #00e5ff; color: #002; font-weight: 700;
+  }
+  .ghost {
+    flex: 1; max-width: 200px; padding: 14px; border-radius: 10px; border: 1px solid #444;
+    background: transparent; color: #ccc;
+  }
+</style>
diff --git a/frontend/src/capture/capture.types.ts b/frontend/src/capture/capture.types.ts
new file mode 100644
index 0000000..caac078
--- /dev/null
+++ b/frontend/src/capture/capture.types.ts
@@ -0,0 +1,131 @@
+// Domain model for the M1 capture flow.
+// The Capture tagged union is the state machine: each branch carries exactly the
+// data its state can hold, so an illegal state is a type error.
+
+// Integer eighths of an inch; divide by 8 only at display.
+export type Eighths = number;
+
+export const inToEighths = (inches: number): Eighths => Math.round(inches * 8);
+export const eighthsToIn = (e: Eighths): number => e / 8;
+
+// Source: all geometry, measurement, and PNG work uses source pixels, never the
+// CSS size of the preview.
+export interface Source {
+  widthPx: number;
+  heightPx: number;
+  blob: Blob;
+}
+
+export type Sheet = 'auto' | 'green' | 'black';
+export interface MaskParams {
+  sheet: Sheet;
+  sensitivity: number; // 0–100, step 1
+}
+
+// Axis-aligned box, source px.
+export interface ABox {
+  x: number;
+  y: number;
+  w: number;
+  h: number;
+}
+
+// Minimum-area bounding rectangle of the mask, source px.
+export interface BBox {
+  corners: [number, number][]; // 4 corners, counter-clockwise
+  longSidePx: number; // longest_axis_px → scale numerator
+  angleDeg: number; // long-side angle, degrees, [0, 180)
+}
+
+// The approved mask is the footprint for axis, measurement, and the inventory PNG.
+export interface Mask {
+  params: MaskParams;
+  slabPx: number; // 0 ⇒ approve blocked, user retakes
+  bitset: Uint8Array; // source-grid mask, 1 byte/px
+  bbox: BBox;
+  slabBounds: ABox; // axis-aligned extent of slab px, for the 80%-fill PNG crop
+}
+
+export interface Axis {
+  bbox: BBox;
+  heading: 1 | -1; // which way along the long side is forward (180° flip)
+}
+
+export interface Widths {
+  min: Eighths;
+  max: Eighths;
+  avg: Eighths;
+  every6In: Eighths[];
+}
+
+export interface Measures {
+  lengthEighths: Eighths;
+  thicknessEighths: Eighths;
+  scale: number; // px per inch
+  widths: Widths;
+  sqft: number; // 2 dp
+  bdft: number; // 2 dp
+  inventoryPng: Blob;
+  sourceBelowFloor: boolean;
+}
+
+// The machine. 'resume' exists only while a draft exists and has not been chosen.
+export type Capture =
+  | { k: 'resume'; draft: Draft }
+  | { k: 'addPhoto' }
+  | {
+      k: 'mask';
+      source: Source;
+      control: MaskParams; // immediate control value (what the UI shows)
+      overlay: Mask | null; // last settled mask; null until first pass
+      failed: boolean;
+    }
+  | {
+      k: 'axis';
+      source: Source;
+      approvedMask: Mask; // frozen footprint
+      heading: 1 | -1;
+    }
+  | {
+      k: 'measure';
+      source: Source;
+      approvedMask: Mask;
+      axis: Axis; // frozen
+      lengthEighths: Eighths;
+      thicknessEighths: Eighths;
+      results: Measures | null;
+    };
+
+// Device draft (IndexedDB): one in-progress slab. Small by design — the bitset
+// and PNG are re-derived from stored data, never stored second-hand.
+export interface Draft {
+  version: 1;
+  stage: 'mask' | 'axis' | 'measure'; // last approved state
+  source: Source;
+  maskParams: MaskParams; // → re-derive mask on resume
+  mask: Omit<Mask, 'bitset' | 'params'>; // slabPx, bbox, slabBounds
+  heading: 1 | -1; // present when stage >= axis
+  lengthEighths: Eighths;
+  thicknessEighths: Eighths;
+  results: Omit<Measures, 'inventoryPng'> | null; // present when results computed
+  inventoryPng: Blob | null; // stored so Continue can show Measure results
+}
+
+// Worker protocol. Job ids increase; the worker drops anything older than the
+// current id, so a stale result can never blank a newer one.
+export type WorkerIn =
+  | { id: number; kind: 'init'; blob: Blob }
+  | { id: number; kind: 'mask'; sheet: Sheet; sensitivity: number }
+  | { id: number; kind: 'invalidate' };
+
+export type WorkerOut =
+  | { id: number; kind: 'decoded'; w: number; h: number }
+  | {
+      id: number;
+      kind: 'ready';
+      slabPx: number;
+      bitset: Uint8Array;
+      bbox: BBox;
+      slabBounds: ABox;
+    }
+  | { id: number; kind: 'failed'; reason: string };
diff --git a/frontend/src/capture/session.ts b/frontend/src/capture/session.ts
new file mode 100644
index 0000000..c9a14c8
--- /dev/null
+++ b/frontend/src/capture/session.ts
@@ -0,0 +1,356 @@
+import { writable } from 'svelte/store';
+import type {
+  Capture, Draft, Eighths, Mask, MaskParams, Measures, Sheet, Source, WorkerIn, WorkerOut,
+} from './capture.types';
+import { eighthsToIn } from './capture.types';
+import { loadDraft, saveDraft, clearDraft } from '../draft/idb';
+import { measure } from '../measure/measure';
+import { encodeInventoryPng } from '../png/inventory';
+
+const DEBOUNCE_MS = 2000;
+const BUSY_MS = 300;
+
+export interface CaptureSession {
+  capture: import('svelte/store').Readable<Capture>;
+  busy: import('svelte/store').Readable<boolean>;
+  resumeProbe(): Promise<void>;
+  continueDraft(): void;
+  startFresh(): void;
+  addPhoto(file: File): Promise<void>;
+  retakes(): void;
+  setSensitivity(n: number): void;
+  setSheet(s: Sheet): void;
+  approveMask(): void;
+  rotateAxis(): void;
+  approveAxis(): void;
+  setLength(e: Eighths): void;
+  setThickness(e: Eighths): void;
+  calculate(): Promise<void>;
+  back(): void;
+  getInventoryUrl(): string | null;
+  dispose(): void;
+}
+
+// The one writer. Owns the worker port, the single debounce timer, and the draft.
+// Every transition to an approved branch persists; no explicit "save".
+export function createCaptureSession(): CaptureSession {
+  const capture = writable<Capture>({ k: 'addPhoto' });
+  const busy = writable(false);
+  let state: Capture = { k: 'addPhoto' };
+  let worker: Worker | null = null;
+  let jobId = 0;
+  let timer: ReturnType<typeof setTimeout> | null = null;
+  let passStarted = 0;
+  let busyTimer: ReturnType<typeof setTimeout> | null = null;
+  let pngUrl: string | null = null;
+  let resumed = false;
+
+  const set = (next: Capture) => {
+    state = next;
+    capture.set(next);
+  };
+
+  const teardownWorker = () => {
+    if (timer) {
+      clearTimeout(timer);
+      timer = null;
+    }
+    if (worker) {
+      worker.postMessage({ id: ++jobId, kind: 'invalidate' } satisfies WorkerIn);
+      worker.terminate();
+      worker = null;
+    }
+    if (pngUrl) {
+      URL.revokeObjectURL(pngUrl);
+      pngUrl = null;
+    }
+  };
+
+  const makeWorker = (blob: Blob) => {
+    if (worker) worker.terminate();
+    worker = new Worker(new URL('../worker/mask.worker.ts', import.meta.url), { type: 'module' });
+    worker.onmessage = (e: MessageEvent<WorkerOut>) => onWorkerOut(e.data);
+    worker.postMessage({ id: ++jobId, kind: 'init', blob } satisfies WorkerIn);
+  };
+
+  const onWorkerOut = (msg: WorkerOut) => {
+    if (msg.id < jobId - 1) return; // stale
+    if (msg.kind === 'decoded') {
+      if (state.k === 'mask') {
+        set({ ...state, source: { ...state.source, widthPx: msg.w, heightPx: msg.h } });
+      }
+      schedulePass();
+      return;
+    }
+    busy.set(false);
+    if (busyTimer) {
+      clearTimeout(busyTimer);
+      busyTimer = null;
+    }
+    if (state.k !== 'mask') return;
+    if (msg.kind === 'failed') {
+      set({ ...state, failed: true });
+      return;
+    }
+    const mask: Mask = {
+      params: { sheet: state.control.sheet, sensitivity: state.control.sensitivity },
+      slabPx: msg.slabPx,
+      bitset: msg.bitset,
+      bbox: msg.bbox,
+      slabBounds: msg.slabBounds,
+    };
+    set({ ...state, overlay: mask, failed: false });
+  };
+
+  const runPass = () => {
+    if (state.k !== 'mask' || !worker) return;
+    passStarted = Date.now();
+    busyTimer = setTimeout(() => busy.set(true), BUSY_MS);
+    worker.postMessage({
+      id: ++jobId,
+      kind: 'mask',
+      sheet: state.control.sheet,
+      sensitivity: state.control.sensitivity,
+    } satisfies WorkerIn);
+  };
+
+  // The 2.0s debounce: re-armed on every control change; a sheet change
+  // recomputes immediately (spec allows), so it clears the pending pass.
+  const schedulePass = () => {
+    if (timer) clearTimeout(timer);
+    timer = setTimeout(runPass, DEBOUNCE_MS);
+  };
+
+  const draftFromState = (): Draft | null => {
+    const strip = (m: Mask) => ({ slabPx: m.slabPx, bbox: m.bbox, slabBounds: m.slabBounds });
+    if (state.k === 'axis') {
+      return {
+        version: 1, stage: 'axis', source: state.source, maskParams: state.approvedMask.params,
+        mask: strip(state.approvedMask), heading: state.heading,
+        lengthEighths: 0, thicknessEighths: 0, results: null, inventoryPng: null,
+      };
+    }
+    if (state.k === 'measure') {
+      const { inventoryPng: _drop, ...rest } = state.results ?? ({} as Measures);
+      return {
+        version: 1, stage: 'measure', source: state.source, maskParams: state.approvedMask.params,
+        mask: strip(state.approvedMask), heading: state.axis.heading,
+        lengthEighths: state.lengthEighths, thicknessEighths: state.thicknessEighths,
+        results: state.results ? rest : null,
+        inventoryPng: state.results?.inventoryPng ?? null,
+      };
+    }
+    return null;
+  };
+
+  const persist = async () => {
+    const d = draftFromState();
+    if (d) await saveDraft(d as Draft);
+  };
+
+  // Re-derive the mask bitset from the stored photo + params so Measure can run.
+  const rederiveMask = (source: Source, params: MaskParams, stub: Omit<Mask, 'bitset' | 'params'>): Promise<Mask> =>
+    new Promise((resolve, reject) => {
+      const w = new Worker(new URL('../worker/mask.worker.ts', import.meta.url), { type: 'module' });
+      let id = 0;
+      const fail = (reason: string) => {
+        w.terminate();
+        reject(new Error(reason));
+      };
+      w.onmessage = (e: MessageEvent<WorkerOut>) => {
+        const msg = e.data;
+        if (msg.kind === 'decoded') {
+          w.postMessage({ id: ++id, kind: 'mask', sheet: params.sheet, sensitivity: params.sensitivity } satisfies WorkerIn);
+          return;
+        }
+        if (msg.kind === 'failed') {
+          fail(msg.reason);
+          return;
+        }
+        if (msg.kind === 'ready') {
+          w.terminate();
+          resolve({
+            params,
+            slabPx: msg.slabPx || stub.slabPx,
+            bitset: msg.bitset,
+            bbox: msg.slabPx > 0 ? msg.bbox : stub.bbox,
+            slabBounds: msg.slabPx > 0 ? msg.slabBounds : stub.slabBounds,
+          });
+        }
+      };
+      w.postMessage({ id: ++id, kind: 'init', blob: source.blob } satisfies WorkerIn);
+    });
+
+  const restoreFromDraft = async (d: Draft) => {
+    const source: Source = { widthPx: d.source.widthPx, heightPx: d.source.heightPx, blob: d.source.blob };
+    if (d.stage === 'mask') {
+      teardownWorker();
+      set({ k: 'mask', source, control: { ...d.maskParams }, overlay: null, failed: false });
+      makeWorker(source.blob);
+      return;
+    }
+    teardownWorker();
+    try {
+      const mask = await rederiveMask(source, d.maskParams, d.mask);
+      if (d.stage === 'axis') {
+        set({ k: 'axis', source, approvedMask: mask, heading: d.heading });
+        return;
+      }
+      if (d.inventoryPng) {
+        if (pngUrl) URL.revokeObjectURL(pngUrl);
+        pngUrl = URL.createObjectURL(d.inventoryPng);
+      }
+      set({
+        k: 'measure', source, approvedMask: mask,
+        axis: { bbox: mask.bbox, heading: d.heading },
+        lengthEighths: d.lengthEighths, thicknessEighths: d.thicknessEighths,
+        results: d.results
+          ? { ...d.results, inventoryPng: d.inventoryPng ?? new Blob() }
+          : null,
+      });
+    } catch {
+      set({ k: 'mask', source, control: { ...d.maskParams }, overlay: null, failed: true });
+      makeWorker(source.blob);
+    }
+  };
+
+  return {
+    capture,
+    busy,
+
+    async resumeProbe() {
+      if (resumed) return;
+      resumed = true;
+      const d = await loadDraft();
+      if (d) set({ k: 'resume', draft: d });
+    },
+
+    continueDraft() {
+      if (state.k !== 'resume') return;
+      void restoreFromDraft(state.draft);
+    },
+
+    async startFresh() {
+      if (state.k !== 'resume') return;
+      teardownWorker();
+      await clearDraft();
+      set({ k: 'addPhoto' });
+    },
+
+    async addPhoto(file: File) {
+      teardownWorker();
+      set({ k: 'mask', source: { widthPx: 0, heightPx: 0, blob: file }, control: { sheet: 'auto', sensitivity: 50 }, overlay: null, failed: false });
+      makeWorker(file);
+    },
+
+    retakes() {
+      teardownWorker();
+      set({ k: 'addPhoto' });
+    },
+
+    setSensitivity(n: number) {
+      if (state.k !== 'mask') return;
+      const s = Math.max(0, Math.min(100, Math.round(n)));
+      set({ ...state, control: { ...state.control, sensitivity: s } });
+      schedulePass();
+    },
+
+    setSheet(s: Sheet) {
+      if (state.k !== 'mask') return;
+      set({ ...state, control: { ...state.control, sheet: s } });
+      runPass();
+    },
+
+    approveMask() {
+      if (state.k !== 'mask' || !state.overlay || state.overlay.slabPx === 0) return;
+      teardownWorker();
+      set({ k: 'axis', source: state.source, approvedMask: state.overlay, heading: 1 });
+      void persist();
+    },
+
+    rotateAxis() {
+      if (state.k !== 'axis') return;
+      set({ ...state, heading: state.heading === 1 ? -1 : 1 });
+      void persist();
+    },
+
+    approveAxis() {
+      if (state.k !== 'axis') return;
+      set({
+        k: 'measure', source: state.source, approvedMask: state.approvedMask,
+        axis: { bbox: state.approvedMask.bbox, heading: state.heading },
+        lengthEighths: 0, thicknessEighths: 0, results: null,
+      });
+      void persist();
+    },
+
+    setLength(e: Eighths) {
+      if (state.k !== 'measure') return;
+      set({ ...state, lengthEighths: Math.max(0, Math.round(e)) });
+      void persist();
+    },
+
+    setThickness(e: Eighths) {
+      if (state.k !== 'measure') return;
+      set({ ...state, thicknessEighths: Math.max(0, Math.round(e)) });
+      void persist();
+    },
+
+    async calculate() {
+      if (state.k !== 'measure') return;
+      const { source, approvedMask, axis, lengthEighths, thicknessEighths } = state;
+      if (lengthEighths === 0 || thicknessEighths === 0) return;
+      const bitmap = await createImageBitmap(source.blob);
+      const base = measure(
+        approvedMask.bitset, source.widthPx, source.heightPx,
+        axis.bbox, axis.heading, lengthEighths, thicknessEighths, approvedMask.slabPx,
+      );
+      let pngBlob: Blob;
+      let belowFloor = false;
+      try {
+        const r = await encodeInventoryPng(bitmap, approvedMask.slabBounds);
+        pngBlob = r.blob;
+        belowFloor = r.sourceBelowFloor;
+      } catch {
+        pngBlob = new Blob();
+      }
+      bitmap.close();
+      if (pngUrl) URL.revokeObjectURL(pngUrl);
+      pngUrl = URL.createObjectURL(pngBlob);
+      const results: Measures = { ...base, inventoryPng: pngBlob, sourceBelowFloor: belowFloor };
+      set({ ...state, results });
+      void persist();
+    },
+
+    back() {
+      if (state.k === 'mask') {
+        teardownWorker();
+        set({ k: 'addPhoto' });
+      } else if (state.k === 'axis') {
+        // back to mask keeps the last approved mask as the live overlay
+        const m = state.approvedMask;
+        set({ k: 'mask', source: state.source, control: m.params, overlay: m, failed: false });
+      } else if (state.k === 'measure') {
+        set({ k: 'axis', source: state.source, approvedMask: state.approvedMask, heading: state.axis.heading });
+      }
+    },
+
+    getInventoryUrl() {
+      return pngUrl;
+    },
+
+    dispose() {
+      teardownWorker();
+    },
+  };
+}
+
+// Display helper: format eighths as inches with fractions.
+export function fmtEighths(e: Eighths): string {
+  const whole = Math.floor(eighthsToIn(e));
+  const rem = e - whole * 8;
+  if (rem === 0) return `${whole}"`;
+  const frac: Record<number, string> = { 1: '1/8', 2: '1/4', 3: '3/8', 4: '1/2', 5: '5/8', 6: '3/4', 7: '7/8' };
+  const part = frac[rem] ?? `${rem}/8`;
+  return whole > 0 ? `${whole} ${part}"` : `${part}"`;
+}
diff --git a/frontend/src/draft/idb.ts b/frontend/src/draft/idb.ts
new file mode 100644
index 0000000..73f822d
--- /dev/null
+++ b/frontend/src/draft/idb.ts
@@ -0,0 +1,25 @@
+import { get, set, del } from 'idb-keyval';
+import type { Draft } from '../capture/capture.types';
+
+const KEY = 'slabuploader-draft';
+
+export async function loadDraft(): Promise<Draft | null> {
+  try {
+    const d = await get<Draft>(KEY);
+    return d && d.version === 1 ? d : null;
+  } catch {
+    return null;
+  }
+}
+
+export async function saveDraft(d: Draft): Promise<void> {
+  await set(KEY, d);
+}
+
+export async function clearDraft(): Promise<void> {
+  try {
+    await del(KEY);
+  } catch {
+    // idb unavailable: draft persistence is best-effort, app state is not
+  }
+}
diff --git a/frontend/src/geometry/rect.ts b/frontend/src/geometry/rect.ts
new file mode 100644
index 0000000..50e4b20
--- /dev/null
+++ b/frontend/src/geometry/rect.ts
@@ -0,0 +1,94 @@
+import type { ABox, BBox } from '../capture/capture.types';
+
+export function slabBounds(bitset: Uint8Array, w: number, h: number): ABox {
+  let minX = w, minY = h, maxX = -1, maxY = -1;
+  for (let y = 0; y < h; y++) {
+    const row = y * w;
+    for (let x = 0; x < w; x++) {
+      if (bitset[row + x]) {
+        if (x < minX) minX = x;
+        if (x > maxX) maxX = x;
+        if (y < minY) minY = y;
+        if (y > maxY) maxY = y;
+      }
+    }
+  }
+  if (maxX < 0) return { x: 0, y: 0, w: 0, h: 0 };
+  return { x: minX, y: minY, w: maxX - minX + 1, h: maxY - minY + 1 };
+}
+
+// Convex hull (Andrew's monotone chain). Points are [x, y].
+export function convexHull(pts: [number, number][]): [number, number][] {
+  const p = [...pts].sort((a, b) => a[0] - b[0] || a[1] - b[1]);
+  if (p.length < 3) return p;
+  const cross = (o: [number, number], a: [number, number], b: [number, number]) =>
+    (a[0] - o[0]) * (b[1] - o[1]) - (a[1] - o[1]) * (b[0] - o[0]);
+  const lower: [number, number][] = [];
+  for (const pt of p) {
+    while (lower.length >= 2 && cross(lower[lower.length - 2], lower[lower.length - 1], pt) <= 0) lower.pop();
+    lower.push(pt);
+  }
+  const upper: [number, number][] = [];
+  for (let i = p.length - 1; i >= 0; i--) {
+    const pt = p[i];
+    while (upper.length >= 2 && cross(upper[upper.length - 2], upper[upper.length - 1], pt) <= 0) upper.pop();
+    upper.push(pt);
+  }
+  lower.pop();
+  upper.pop();
+  return lower.concat(upper);
+}
+
+// Rotating calipers: true minimum-area bounding rectangle of the mask.
+export function minAreaRect(bitset: Uint8Array, w: number, h: number): BBox | null {
+  const pts: [number, number][] = [];
+  for (let y = 0; y < h; y++) {
+    const row = y * w;
+    for (let x = 0; x < w; x++) if (bitset[row + x]) pts.push([x, y]);
+  }
+  if (pts.length < 2) return null;
+  const hull = convexHull(pts);
+
+  let best = { area: Infinity, cx: 0, cy: 0, ux: 1, uy: 0, hw: 0, hh: 0 };
+  const n = hull.length;
+  for (let i = 0; i < n; i++) {
+    const j = (i + 1) % n;
+    const ex = hull[j][0] - hull[i][0];
+    const ey = hull[j][1] - hull[i][1];
+    const len = Math.hypot(ex, ey);
+    if (len === 0) continue;
+    const ux = ex / len, uy = ey / len;
+    const vx = -uy, vy = ux;
+    let minU = Infinity, maxU = -Infinity, minV = Infinity, maxV = -Infinity;
+    for (let k = 0; k < n; k++) {
+      const dx = hull[k][0] - hull[i][0];
+      const dy = hull[k][1] - hull[i][1];
+      const u = dx * ux + dy * uy;
+      const v = dx * vx + dy * vy;
+      if (u < minU) minU = u;
+      if (u > maxU) maxU = u;
+      if (v < minV) minV = v;
+      if (v > maxV) maxV = v;
+    }
+    const rw = maxU - minU;
+    const rh = maxV - minV;
+    const area = rw * rh;
+    if (area < best.area) {
+      best = { area, cx: hull[i][0] + (minU + maxU) / 2 * ux + (minV + maxV) / 2 * vx, cy: hull[i][1] + (minU + maxU) / 2 * uy + (minV + maxV) / 2 * vy, ux, uy, hw: rw / 2, hh: rh / 2 };
+    }
+  }
+
+  // long-side direction: the edge with the larger extent
+  const lu = best.hw >= best.hh ? best.ux : -best.uy;
+  const lv = best.hw >= best.hh ? best.uy : best.ux;
+  const su = best.hw >= best.hh ? -best.uy : best.ux;
+  const sv = best.hw >= best.hh ? -best.ux : -best.uy;
+  const halfL = best.hw >= best.hh ? best.hw : best.hh;
+  const halfS = best.hw >= best.hh ? best.hh : best.hw;
+  const corners: [number, number][] = [];
+  for (const [a, b] of [[1, 1], [1, -1], [-1, -1], [-1, 1]] as const) {
+    corners.push([best.cx + a * halfL * lu + b * halfS * su, best.cy + a * halfL * lv + b * halfS * sv]);
+  }
+  const angleDeg = ((Math.atan2(lv, lu) * 180) / Math.PI + 180) % 180;
+  return { corners, longSidePx: halfL * 2, angleDeg };
+}
diff --git a/frontend/src/main.ts b/frontend/src/main.ts
new file mode 100644
index 0000000..7996954
--- /dev/null
+++ b/frontend/src/main.ts
@@ -0,0 +1,4 @@
+import App from './App.svelte';
+
+const root = document.querySelector('#app');
+if (root) new App({ target: root });
diff --git a/frontend/src/measure/measure.ts b/frontend/src/measure/measure.ts
new file mode 100644
index 0000000..df3269d
--- /dev/null
+++ b/frontend/src/measure/measure.ts
@@ -0,0 +1,75 @@
+import type { BBox, Eighths, Measures, Widths } from '../capture/capture.types';
+
+// Long-side start point per heading: heading 1 starts at corners[1] so that
+// the axis reads corners[1] -> corners[0] (see rect.ts corner order).
+export function axisEndpoints(bbox: BBox, heading: 1 | -1): { start: [number, number]; end: [number, number] } {
+  return heading === 1 ? { start: bbox.corners[1], end: bbox.corners[0] } : { start: bbox.corners[0], end: bbox.corners[1] };
+}
+
+// Sampled every 6 in along the axis; each sample is a line probe perpendicular
+// to the axis, width = max run of slab px across the probe.
+function sampleWidths(
+  bitset: Uint8Array, w: number, h: number,
+  start: [number, number], end: [number, number],
+  scale: number, lengthIn: number,
+): Eighths[] {
+  const dx = end[0] - start[0];
+  const dy = end[1] - start[1];
+  const len = Math.hypot(dx, dy) || 1;
+  const ax = dx / len, ay = dy / len;
+  const px = -ay, py = ax; // perpendicular
+  const stepPx = 6 * scale;
+  const count = Math.max(1, Math.floor(lengthIn / 6) + 1);
+  const out: Eighths[] = [];
+  const half = Math.max(2, Math.round((w + h) / 4));
+  for (let i = 0; i < count; i++) {
+    const t = (i / (count - 1 || 1)) * len;
+    const ox = start[0] + ax * t;
+    const oy = start[1] + ay * t;
+    let minP = Infinity, maxP = -Infinity;
+    for (let p = -half; p <= half; p++) {
+      const x = Math.round(ox + px * p);
+      const y = Math.round(oy + py * p);
+      if (x < 0 || y < 0 || x >= w || y >= h) continue;
+      if (bitset[y * w + x]) {
+        if (p < minP) minP = p;
+        if (p > maxP) maxP = p;
+      }
+    }
+    if (maxP < minP) continue; // no slab px on this probe
+    out.push(Math.max(0, Math.round(((maxP - minP + 1) / scale) * 8)));
+  }
+  return out;
+}
+
+export function measure(
+  bitset: Uint8Array, w: number, h: number,
+  bbox: BBox, heading: 1 | -1,
+  lengthEighths: Eighths, thicknessEighths: Eighths,
+  slabPx: number,
+): Omit<Measures, 'inventoryPng'> & { sourceBelowFloor: false } {
+  const lengthIn = lengthEighths / 8;
+  const scale = bbox.longSidePx / lengthIn;
+  const { start, end } = axisEndpoints(bbox, heading);
+  const every6In = sampleWidths(bitset, w, h, start, end, scale, lengthIn);
+  let widths: Widths;
+  if (every6In.length > 0) {
+    const min = Math.min(...every6In);
+    const max = Math.max(...every6In);
+    const avg = Math.round(every6In.reduce((a, b) => a + b, 0) / every6In.length);
+    widths = { min, max, avg, every6In };
+  } else {
+    widths = { min: 0, max: 0, avg: 0, every6In: [] };
+  }
+  const sqft = Math.round((slabPx / (scale * scale) / 144) * 100) / 100;
+  const bdft = Math.round(sqft * (thicknessEighths / 8) * 100) / 100;
+  return {
+    lengthEighths,
+    thicknessEighths,
+    scale,
+    widths,
+    sqft,
+    bdft,
+    sourceBelowFloor: false,
+  };
+}
diff --git a/frontend/src/png/inventory.ts b/frontend/src/png/inventory.ts
new file mode 100644
index 0000000..acc69cc
--- /dev/null
+++ b/frontend/src/png/inventory.ts
@@ -0,0 +1,38 @@
+import type { ABox } from '../capture/capture.types';
+
+const FLOOR = 1600; // shorter side, px
+const FILL = 0.8; // 80% fill at widest and tallest points
+const MARGIN = 0.08; // crop padding around slab bounds
+const ASPECT_W = 3;
+const ASPECT_H = 4;
+
+// 3:4 portrait RGBA PNG: slab centered at 80% fill (widest and tallest points),
+// shorter side >= 1600 when the source can supply it. No upscale: an undersized
+// source yields sourceBelowFloor = true (warn + require a new photo).
+export async function encodeInventoryPng(
+  bitmap: ImageBitmap,
+  slab: ABox,
+): Promise<{ blob: Blob; sourceBelowFloor: boolean }> {
+  const cw = Math.round(slab.w * (1 + 2 * MARGIN));
+  const ch = Math.round(slab.h * (1 + 2 * MARGIN));
+  const sx = Math.max(0, Math.round(slab.x - slab.w * MARGIN));
+  const sy = Math.max(0, Math.round(slab.y - slab.h * MARGIN));
+  const srcW = Math.min(bitmap.width - sx, Math.max(1, cw));
+  const srcH = Math.min(bitmap.height - sy, Math.max(1, ch));
+
+  const belowFloor = Math.min(srcW, srcH) < FLOOR;
+  // Portrait 3:4: width is the shorter side. Meet the floor when source allows.
+  const outW = belowFloor ? Math.max(1, Math.min(srcW, FLOOR)) : FLOOR;
+  const outH = Math.round((outW * ASPECT_H) / ASPECT_W);
+  const canvas = new OffscreenCanvas(outW, outH);
+  const ctx = canvas.getContext('2d')!;
+  ctx.clearRect(0, 0, outW, outH);
+  const maxW = outW * FILL;
+  const maxH = outH * FILL;
+  const scale = Math.min(maxW / srcW, maxH / srcH);
+  const dw = srcW * scale;
+  const dh = srcH * scale;
+  ctx.drawImage(bitmap, sx, sy, srcW, srcH, (outW - dw) / 2, (outH - dh) / 2, dw, dh);
+  const blob = await canvas.convertToBlob({ type: 'image/png' });
+  return { blob, sourceBelowFloor: belowFloor };
+}
diff --git a/frontend/src/worker/mask.worker.ts b/frontend/src/worker/mask.worker.ts
new file mode 100644
index 0000000..d7caa6c
--- /dev/null
+++ b/frontend/src/worker/mask.worker.ts
@@ -0,0 +1,107 @@
+import { minAreaRect, slabBounds } from '../geometry/rect';
+import type { MaskParams, WorkerIn, WorkerOut } from '../capture/capture.types';
+
+let bitmap: ImageBitmap | null = null;
+let data: Uint8ClampedArray | null = null;
+let w = 0, h = 0;
+let current = 0; // highest job id issued by main; older replies are dropped
+
+// Keep slab pixels; remove the sheet. Higher sensitivity widens the sheet match.
+const greenKeep = (r: number, g: number, b: number, s: number): boolean => {
+  const t = s / 100;
+  const isSheet = g - Math.max(r, b) > 10 + 35 * t;
+  return !isSheet;
+};
+const blackKeep = (r: number, g: number, b: number, s: number): boolean => {
+  const lum = 0.2126 * r + 0.7152 * g + 0.0722 * b;
+  const isSheet = lum < 40 + 140 * (s / 100);
+  return !isSheet;
+};
+const autoPick = (samples: { r: number; g: number; b: number }[]): 'green' | 'black' => {
+  let gr = 0, gl = 0;
+  for (const p of samples) {
+    if (p.g - Math.max(p.r, p.b) > 20) gr++;
+    if (0.2126 * p.r + 0.7152 * p.g + 0.0722 * p.b < 70) gl++;
+  }
+  return gl >= gr ? 'black' : 'green';
+};
+
+function runMask(params: MaskParams, id: number): WorkerOut {
+  if (!data) return { id, kind: 'failed', reason: 'no source decoded' };
+  let sheet = params.sheet;
+  if (sheet === 'auto') {
+    const samples: { r: number; g: number; b: number }[] = [];
+    for (let y = 0; y < h; y += 16)
+      for (let x = 0; x < w; x += 16) {
+        const i = (y * w + x) * 4;
+        samples.push({ r: data[i], g: data[i + 1], b: data[i + 2] });
+      }
+    sheet = autoPick(samples);
+  }
+  const keep = sheet === 'green' ? greenKeep : blackKeep;
+  const s = Math.max(0, Math.min(100, params.sensitivity));
+  const bitset = new Uint8Array(w * h);
+  let slabPx = 0;
+  for (let i = 0, p = 0; i < data.length; i += 4, p++) {
+    if (keep(data[i], data[i + 1], data[i + 2], s)) {
+      bitset[p] = 1;
+      slabPx++;
+    }
+  }
+  if (slabPx === 0) {
+    return { id, kind: 'ready', slabPx: 0, bitset, bbox: { corners: [], longSidePx: 0, angleDeg: 0 }, slabBounds: { x: 0, y: 0, w: 0, h: 0 } };
+  }
+  const bbox = minAreaRect(bitset, w, h);
+  if (!bbox) {
+    return { id, kind: 'ready', slabPx: 0, bitset, bbox: { corners: [], longSidePx: 0, angleDeg: 0 }, slabBounds: { x: 0, y: 0, w: 0, h: 0 } };
+  }
+  return { id, kind: 'ready', slabPx, bitset, bbox, slabBounds: slabBounds(bitset, w, h) };
+}
+
+self.onmessage = (e: MessageEvent<WorkerIn>) => {
+  const msg = e.data;
+  if (msg.id < current) return; // superseded by a newer job
+  current = msg.id;
+  if (msg.kind === 'init') {
+    if (bitmap) {
+      bitmap.close();
+      bitmap = null;
+    }
+    data = null;
+    w = h = 0;
+    createImageBitmap(msg.blob)
+      .then((bmp) => {
+        w = bmp.width;
+        h = bmp.height;
+        const canvas = new OffscreenCanvas(w, h);
+        const ctx = canvas.getContext('2d')!;
+        ctx.drawImage(bmp, 0, 0);
+        data = ctx.getImageData(0, 0, w, h).data;
+        bitmap = bmp;
+        self.postMessage({ id: msg.id, kind: 'decoded', w, h } as WorkerOut);
+      })
+      .catch((err) => self.postMessage({ id: msg.id, kind: 'failed', reason: String(err) } satisfies WorkerOut));
+    return;
+  }
+  if (msg.kind === 'invalidate') {
+    if (bitmap) {
+      bitmap.close();
+      bitmap = null;
+    }
+    data = null;
+    w = h = 0;
+    return;
+  }
+  try {
+    const out = runMask({ sheet: msg.sheet, sensitivity: msg.sensitivity }, msg.id);
+    if (out.kind === 'ready') {
+      self.postMessage(out, [out.bitset.buffer]);
+    } else {
+      self.postMessage(out);
+    }
+  } catch (err) {
+    self.postMessage({ id: msg.id, kind: 'failed', reason: String(err) } satisfies WorkerOut);
+  }
+};
+
+export {};
diff --git a/frontend/tsconfig.json b/frontend/tsconfig.json
new file mode 100644
index 0000000..6eaf9f3
--- /dev/null
+++ b/frontend/tsconfig.json
@@ -0,0 +1,16 @@
+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "module": "ESNext",
+    "moduleResolution": "bundler",
+    "strict": true,
+    "noEmit": true,
+    "lib": ["ES2022", "DOM", "DOM.Iterable", "WebWorker"],
+    "skipLibCheck": true,
+    "isolatedModules": true,
+    "resolveJsonModule": true,
+    "verbatimModuleSyntax": false,
+    "types": ["vite/client"]
+  },
+  "include": ["src/**/*.ts", "src/**/*.svelte", "vite.config.ts"]
+}
diff --git a/frontend/vite.config.ts b/frontend/vite.config.ts
new file mode 100644
index 0000000..d6d3d75
--- /dev/null
+++ b/frontend/vite.config.ts
@@ -0,0 +1,8 @@
+import { defineConfig } from 'vite';
+import { svelte } from '@sveltejs/vite-plugin-svelte';
+import sveltePreprocess from 'svelte-preprocess';
+
+export default defineConfig({
+  plugins: [svelte({ preprocess: sveltePreprocess() })],
+  worker: { format: 'es' },
+});