test(photos): overlay UAT nits + 90% fill expect (#67,#68)

Lock length dim to mask tip-to-tip (not oversized bbox), require width
labelAt on axis-left off the wood, smaller font contract, and 90% crop
fill extent. Red before green.

frontend/src/png/inventory.test.ts

@@ -81,7 +81,7 @@ test('mid-band: slab shorter side 1000 (between 800 and 1600) → at floor, not
   assert.equal(out.width, 800);
 });
 
-test('80% fill: limiting dimension maps to 0.8 × frame side', () => {
+test('90% fill: limiting dimension maps to 0.9 × frame side (#68)', () => {
   const source: Pick<Source, 'widthPx' | 'heightPx'> = { widthPx: 2200, heightPx: 2000 };
   const bitset = new Uint8Array(source.widthPx * source.heightPx).fill(1);
   const out = composeInventoryFrame(
@@ -103,8 +103,8 @@ test('80% fill: limiting dimension maps to 0.8 × frame side', () => {
   const xs = [minx, maxx], ys = [miny, maxy];
   const wExtent = Math.max(...xs) - Math.min(...xs) + 1;
   const hExtent = Math.max(...ys) - Math.min(...ys) + 1;
-  assert.ok(Math.abs(wExtent - 640) <= 2, `width extent ${wExtent} ≈ 640 (0.8×800)`);
-  assert.ok(Math.abs(hExtent - 576) <= 2, `height extent ${hExtent} ≈ 576 (1800×0.32)`);
+  assert.ok(Math.abs(wExtent - 720) <= 2, `width extent ${wExtent} ≈ 720 (0.9×800)`);
+  assert.ok(Math.abs(hExtent - 648) <= 2, `height extent ${hExtent} ≈ 648 (1800×0.36)`);
 });
 
 test('belowFloor: small slab → sourceBelowFloor, outW capped at floor (no upscale)', () => {