Recover modal preview rendering and card fallbacks

TODO.md

@@ -255,6 +255,21 @@
   - backend debug broadcasts
 
 ## Recent Change Log
+- Date: `2026-03-16`
+- What changed:
+  - Rewired the result modal to consume backend media metadata instead of hard-coded source branches.
+  - Google Video now uses embed-first modal rendering again, with iframe timeout fallback to thumbnail/panel mode.
+  - Search cards now suppress low-value favicon/logo thumbnails and show a neutral “preview unavailable” media state instead of tiny site icons or placeholder-like junk.
+  - Bumped frontend asset version so browsers pick up the new modal logic.
+- Why it changed:
+  - The UI was still rendering Google Video as a static image panel, and Envato/Artgrid cards were surfacing unusable thumbnails that made the results look broken even when metadata existed.
+- How it was verified:
+  - `go test ./...`
+  - `bash scripts/selftest.sh`
+- What is still risky or incomplete:
+  - Browser-level validation was still not fully reproducible here, so iframe timeout behavior and provider-specific rendering quirks still need live confirmation in the deployed UI.
+  - `node` is not installed in this environment, so frontend syntax/build verification is still limited to static inspection plus app boot smoke testing.
+
 - Date: `2026-03-16`
 - What changed:
   - Hardened search result enrichment and recommendation metadata for preview recovery work.