fix(integrations): repair corrupt icons, backfill missing block metas, restore scroll on back-nav (#5342)

* fix(integrations): repair corrupt icons, backfill missing block metas, restore scroll on back-nav

- Restore 7 brand icons (Google, Outlook, MongoDB, Postgres, OpenRouter, Groq, Cerebras) whose SVG path data was corrupted by a past bulk reformat, flooding the integrations page console with <path> parse errors; add a check:icon-paths CI gate that validates every icon d attribute (operand counts + arc flags).
- Backfill BlockMeta (tags/url/templates/skills) for postgresql, mysql, ssh, sftp, smtp — previously catalog integrations with empty detail pages; add an integration meta-coverage CI check so every catalog block must have a meta.
- Add scroll-position restoration for the integrations index/detail inner scroll containers so browser Back returns to where you were.
- Remove the error digest pill from the shared workspace ErrorShell (kept in logs, dropped from UI).

* fix(integrations): make scroll restoration robust — value-based echo detection + Back/Forward-only gate

Addresses review: replace the racy programmatic-scroll flag with value comparison (a restore's echo equals lastApplied and is ignored, so a stuck flag can never drop the first user scroll or overwrite the saved target), and gate restoration on popstate history traversals so fresh push navigations open at the top instead of jumping mid-list. TSDoc-only comments.

* fix(ci): attribute icon-path errors for export-const icons too

Greptile review: iconNameAt only matched 'export function', so a malformed path inside an 'export const XxxIcon = (...)' arrow-function icon would be misattributed to the preceding function-declared icon. Match both forms (mirrors check-bare-icons indexIconBodies).

.github/workflows/test-build.yml

@@ -128,6 +128,9 @@ jobs:
       - name: Bare-icon theme-safety audit
         run: bun run check:bare-icons
 
+      - name: Icon SVG path validity audit
+        run: bun run check:icon-paths
+
       - name: Verify realtime prune graph
         run: bun run check:realtime-prune