fix(ai): drop image from icon resolver noise list — it's a real lucide key

Why: my prior C3 resolver fix added `image` to ICON_NOISE_WORDS so
"Image Placeholder Path" (a non-icon container name) wouldn't collapse
to a circle. That was overcorrecting — `image` is also the canonical
Lucide icon key for the picture/photo glyph, and the model frequently
emits "Image Icon" meaning exactly that. With image stripped, "Image
Icon" tokenised to [] and the resolver returned without writing the
matched lucide:image path.

What: remove `image` from ICON_NOISE_WORDS, with an inline note that
the multi-word "Image Placeholder Path" pattern still resolves through
the prefix fallback (`image` covers >= 50% of `imageplaceholder` so
findPrefixFallback picks it up). Add a regression test for "Image Icon"
→ /image/.

1070 / 1070 AI tests pass (was 1069; +1).

apps/web/src/services/ai/__tests__/icon-resolver.test.ts

@@ -166,6 +166,12 @@ describe('applyIconPathResolution — opt-in marker gate', () => {
     ['Dismiss Icon', /x/],
     ['Cancel Icon', /x/],
     ['Remove Icon', /x/],
+    // `image` must NOT be in the noise word list — "Image Icon" is the
+    // standard lucide:image lookup and the user almost certainly means
+    // a picture icon, not "no signal". (`Image SVG` alone has no icon
+    // marker word so it bypasses the resolver entirely — that's correct
+    // because the path could be a real SVG file ref.)
+    ['Image Icon', /image/],
   ])('resolves multi-word path name "%s" to %s', (name, expectedIconId) => {
     const node = makePath({ name });
     applyIconPathResolution(node);

apps/web/src/services/ai/icon-resolver.ts

@@ -68,7 +68,11 @@ const ICON_NOISE_WORDS = new Set([
   'fill',
   'svg',
   'graphic',
-  'image',
+  // Note: `image` is INTENTIONALLY not a noise word. It's a real lucide
+  // icon key, and "Image Icon" / "Image SVG" should resolve to lucide:image
+  // — not collapse to empty after stripping. Multi-word name patterns like
+  // "Image Placeholder Path" still resolve via the prefix fallback (`image`
+  // covers >= 50% of `imageplaceholder`).
 ]);
 
 function tokenizeName(name: string): string[] {