M3 Review→Publish UI (#77): one-column flow, searchable pickers, fig/feat tags, e2e

- Review screen: slug-resolved species/wcat groupers, case-insensitive attrs,
  fig-*/feat-* tag pickers (METADATA-30/40), AI-assist labels + AI bubbles.
- App orchestrator: single writable flow store, capture→review→publish, Resume boot.
- API client (slabs.ts) mirroring live backend routes; Blob name fix.
- Playwright e2e (7 tests, hermetic mock): canvas PNG seed, client-UUID mock,
  SKU blur commit, ready-state reactive fix; expect timeout 4s, 2 workers.
- e2e green 7/7 in 6s; check_requirements + check_coverage PASS.

frontend/src/capture/MeasurePanel.svelte

@@ -16,6 +16,8 @@
   export let calculate: () => Promise<void>;
   export let back: () => void;
   export let pngUrl: string | null;
+  /** C2: hand off the calibrated capture to Review (App builds the slab + uploads). */
+  export let onContinue: (() => void) | undefined = undefined;
 
   let calcBusy = false;
   let lengthIn = state.lengthEighths === 0 ? '' : String(eighthsToIn(state.lengthEighths));
@@ -177,6 +179,11 @@
 
     <div class="row">
       <button type="button" class="ghost" on:click={back}>Back</button>
+      {#if onContinue}
+        <button type="button" class="primary" data-testid="continue-to-review" on:click={onContinue}>
+          Continue to Review
+        </button>
+      {/if}
     </div>
   {/if}
 </section>