test(moon): judge the editor after the mode transition; fresh screenshot fingerprint (#718)

Validate on the conveyor's rebase 98d98e83 was red twice over:

- smoke_moon_static ac5_noMoonInTheEditor sampled the plan editor two
  frames after `setMode('plan')`, while the View -> editor transition (#101)
  was still running and the sky layer was legitimately fading out. Locally
  2 of 3 runs red on 98d98e83. The check now waits for the transition to
  end (no `_modeTransitionBusy`, no `mode-transition` class) and turns red
  if it never does; 5 of 5 runs green.
- the branch changes visual sources, so the screenshot check is strict on
  it, and #725 moved the sources under the fingerprint. `docs:accept
  --identical`: all 11 frames pixel-identical, only the fingerprint moves.

Issue: #718
User-Visible: no
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018qZfe7YS4rqEMKoVeS3GKd

demo/smoke_moon_static.mjs

@@ -245,6 +245,10 @@ const sameBox = (a, b) => !!a && !!b && a.every((value, index) => Math.abs(value
   const stopSampling = () => page.evaluate(() => { window.__hpSkyStop = true; return window.__hpSkySamples; });
   await sample();
   await page.evaluate(() => window.__hpTest.setMode('plan'));
+  // The View → editor transition (#101) runs for frames after `setMode`: judge
+  // the editor once it has ended, not two frames in (#718 r1: red under load).
+  const editorSettled = await until(page, () => !window.__card._modeTransitionBusy
+    && !window.__card.renderRoot.querySelector('.stage')?.classList.contains('mode-transition'));
   await settle(page);
   const toEditor = await stopSampling();
   const inEditor = await moonState(page);
@@ -258,7 +262,7 @@ const sameBox = (a, b) => !!a && !!b && a.every((value, index) => Math.abs(value
   report.ac5 = { between: between.length, toEditor: toEditor.length, inEditor, firstBack, backInView };
   checks.ac5_skyFollowsTheViewWeight = between.length > 0
     && toEditor.every((frame) => frame.sky === null || Math.abs(frame.sky - frame.weight) <= 0.02);
-  checks.ac5_noMoonInTheEditor = inEditor.count === 0 && inEditor.sky === 0;
+  checks.ac5_noMoonInTheEditor = editorSettled && inEditor.count === 0 && inEditor.sky === 0;
   checks.ac5_backInViewAtOnce = !!firstBack && firstBack.moon.on && firstBack.moon.opacity === 1
     && backInView.on && backInView.opacity === 1 && backInView.parent === 'hp-moon-sky';
   await browser.close();

docs/images/screenshots.json

@@ -3,7 +3,7 @@
   "fixture": "synthetic-only",
   "chromium": "151.0.7922.34",
   "oxipng": null,
-  "sourceFingerprint": "2c4b16527004611d48a6cf52debd9ccd04c0eef6ab9a02f2484a02cf3d0a055a",
+  "sourceFingerprint": "82729cc9b1a6ae03478bfd96f7c101e549599d944b3be4b924c36b1139cf70dd",
   "captureScriptSha256": "e2d14d89de793011615662af7c83c433768d4761f6cec7f0b3860c797494299e",
   "command": "npm run build && node demo/docs/capture.mjs",
   "scenarios": {
@@ -15,7 +15,7 @@
       },
       "theme": "dark",
       "language": "en",
-      "sourceSha256": "2c4b16527004611d48a6cf52debd9ccd04c0eef6ab9a02f2484a02cf3d0a055a",
+      "sourceSha256": "82729cc9b1a6ae03478bfd96f7c101e549599d944b3be4b924c36b1139cf70dd",
       "imageSha256": "de1ee062cfffa375f66ff74509ad9ddbf6aabc5c5440733fe1ff0ea5a40e96c7"
     },
     "view-touch": {
@@ -26,7 +26,7 @@
       },
       "theme": "dark",
       "language": "en",
-      "sourceSha256": "2c4b16527004611d48a6cf52debd9ccd04c0eef6ab9a02f2484a02cf3d0a055a",
+      "sourceSha256": "82729cc9b1a6ae03478bfd96f7c101e549599d944b3be4b924c36b1139cf70dd",
       "imageSha256": "f9dd5b54f86b814c00bc84149af84485f052b103cdcc9263b5c50bf5d32c69d6"
     },
     "space-create": {
@@ -37,7 +37,7 @@
       },
       "theme": "dark",
       "language": "en",
-      "sourceSha256": "2c4b16527004611d48a6cf52debd9ccd04c0eef6ab9a02f2484a02cf3d0a055a",
+      "sourceSha256": "82729cc9b1a6ae03478bfd96f7c101e549599d944b3be4b924c36b1139cf70dd",
       "imageSha256": "aab4811bba3afa6cc849cb9d3989d126b8c327b69a2f8f853e55fc077e0e9a1b"
     },
     "room-contour-close": {
@@ -48,7 +48,7 @@
       },
       "theme": "dark",
       "language": "en",
-      "sourceSha256": "2c4b16527004611d48a6cf52debd9ccd04c0eef6ab9a02f2484a02cf3d0a055a",
+      "sourceSha256": "82729cc9b1a6ae03478bfd96f7c101e549599d944b3be4b924c36b1139cf70dd",
       "imageSha256": "96a7e691ad8167103199a58b48b31ae2fc4f03e9616b65a5096dc8d0b9b51da0"
     },
     "plan-context-tray": {
@@ -59,7 +59,7 @@
       },
       "theme": "dark",
       "language": "en",
-      "sourceSha256": "2c4b16527004611d48a6cf52debd9ccd04c0eef6ab9a02f2484a02cf3d0a055a",
+      "sourceSha256": "82729cc9b1a6ae03478bfd96f7c101e549599d944b3be4b924c36b1139cf70dd",
       "imageSha256": "ebb89bacfecd16178534e1f02fed8bb7540072a691ec4d4b14407c0b8ec4455e"
     },
     "device-editor": {
@@ -70,7 +70,7 @@
       },
       "theme": "dark",
       "language": "en",
-      "sourceSha256": "2c4b16527004611d48a6cf52debd9ccd04c0eef6ab9a02f2484a02cf3d0a055a",
+      "sourceSha256": "82729cc9b1a6ae03478bfd96f7c101e549599d944b3be4b924c36b1139cf70dd",
       "imageSha256": "b40f843d7bcab902a6f697cc76735e6d3351a95443fe11ba761f0e39613120bc"
     },
     "device-display-preview": {
@@ -81,7 +81,7 @@
       },
       "theme": "dark",
       "language": "en",
-      "sourceSha256": "2c4b16527004611d48a6cf52debd9ccd04c0eef6ab9a02f2484a02cf3d0a055a",
+      "sourceSha256": "82729cc9b1a6ae03478bfd96f7c101e549599d944b3be4b924c36b1139cf70dd",
       "imageSha256": "835e9f1b9446072a2caa2421b06a669eac9e5c0e3e6cf94106dd6cc2dd0d8e2b"
     },
     "background-editor": {
@@ -92,7 +92,7 @@
       },
       "theme": "dark",
       "language": "en",
-      "sourceSha256": "2c4b16527004611d48a6cf52debd9ccd04c0eef6ab9a02f2484a02cf3d0a055a",
+      "sourceSha256": "82729cc9b1a6ae03478bfd96f7c101e549599d944b3be4b924c36b1139cf70dd",
       "imageSha256": "98a8c735165912b49b4254d2f975a61891e5737b0a9c16c627f08d60853fa8a7"
     },
     "room-card": {
@@ -103,7 +103,7 @@
       },
       "theme": "dark",
       "language": "en",
-      "sourceSha256": "2c4b16527004611d48a6cf52debd9ccd04c0eef6ab9a02f2484a02cf3d0a055a",
+      "sourceSha256": "82729cc9b1a6ae03478bfd96f7c101e549599d944b3be4b924c36b1139cf70dd",
       "imageSha256": "d47988b03e6a078508b27b5612b6eafe8ecc33c891b589ddda1cc7c71f43b7c8"
     },
     "device-info": {
@@ -114,7 +114,7 @@
       },
       "theme": "dark",
       "language": "en",
-      "sourceSha256": "2c4b16527004611d48a6cf52debd9ccd04c0eef6ab9a02f2484a02cf3d0a055a",
+      "sourceSha256": "82729cc9b1a6ae03478bfd96f7c101e549599d944b3be4b924c36b1139cf70dd",
       "imageSha256": "a10e6044376b087ba6800a31a229e4166a6797820104860f85a4659d89ee8045"
     },
     "pdf-export": {
@@ -125,7 +125,7 @@
       },
       "theme": "light",
       "language": "en",
-      "sourceSha256": "2c4b16527004611d48a6cf52debd9ccd04c0eef6ab9a02f2484a02cf3d0a055a",
+      "sourceSha256": "82729cc9b1a6ae03478bfd96f7c101e549599d944b3be4b924c36b1139cf70dd",
       "imageSha256": "788a1ff32d6ceb51c9fb47ea37922ab15aeddf3fdcf3686bfcb0709634c41f0e"
     }
   },