Send diagnostic view state as model context to MCP host

[rafavalls]

Summary

• Adds web/hooks/use-model-context.ts — a debounced hook that pushes the current diagnostic state to the MCP host via app.updateModelContext
• Wires the hook into DiagnosticsPage so the host always knows whether the user is on the home screen, analyzing a URL, or viewing a specific report (including title, URL, health score, and truncated report content)
• Clears context on unmount

Test Plan

• Open the diagnostics tool in the MCP host and verify context updates appear when navigating between home, loading, and report views
• Verify context is cleared when the tool is unmounted

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Summary by cubic

Send the Diagnostics view state to the MCP host as model context so the host always knows what the user is looking at. Adds a debounced hook and wires it into DiagnosticsPage.

• New Features
  • Added web/hooks/use-model-context.ts — debounced (500ms) updates via app.updateModelContext.
  • Sends view states: home (recent diagnostics summary), analyzing (URL), and report (title, URL, id, health score, date, summary, and report preview truncated to 2000 chars).
  • Integrated into DiagnosticsPage; updates on view/history changes and clears context on unmount.

^{Written for commit 3e58afe. Summary will update on new commits.}

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Status	Name	Latest Commit	Updated (UTC)
✅ Deployment successful! View logs	site-diagnostics	3e58afe	Apr 20 2026, 09:22 PM