feat: replace project dropdown with filtering typeahead

[mariusvniekerk]

Summary

• Replace the native <select> dropdown for project filtering with a custom typeahead component that filters as you type
• Supports keyboard navigation (arrow keys, Enter, Escape), substring match highlighting, and responsive dropdown height (50vh)
• Applied to both the header and the insights page project filter
• Handles hundreds of projects gracefully

Test plan

• Open AgentsView with multiple projects and verify the typeahead appears in the header
• Type to filter projects and confirm substring highlighting works
• Verify keyboard navigation (arrows, Enter, Escape) works
• Check the insights page also uses the typeahead for project filtering
• Test in both light and dark mode for highlight visibility
• Verify dropdown height scales with viewport

🤖 Generated with Claude Code

[roborev-ci]

roborev: Combined Review (767efc3)

Verdict: The implementation is secure and structurally sound, but introduces a medium-severity usability issue in the new dropdown component.

Medium

Blur handling can close the dropdown during in-dropdown
interactions
File: ProjectTypeahead.svelte:84
handleBlur closes when relatedTarget is null. That commonly happens when clicking non-focusable parts (including the scrollbar/track), meaning long result lists can close unexpectedly while the user is trying to scroll.
Suggested fix: Use outside-click detection (pointerdown on document + containerEl.contains(target)) or prevent blur
-close when pointer interaction starts inside the dropdown.

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Synthesized from 4 reviews (agents: codex, gemini | types: default, security)

[roborev-ci]

roborev: Combined Review (f79013b)

Summary Verdict: The code changes securely implement the new ProjectTypeahead component,
but introduce a medium-severity bug regarding dropdown state management.

Medium

• Dropdown can remain stuck open after scrollbar/non-focusable click
  • Files: [ProjectTypeahead.svelte:89](/home/roborev/.roborev/clones/wesm/agentsview/
    frontend/src/lib/components/layout/ProjectTypeahead.svelte:89), [ProjectTypeahead.svelte:104](/home/roborev/.roborev/clones/wesm/agentsview/frontend/src/lib/components/layout/ProjectTypeahead.svelte:10

• Description: handleBlur skips closing when pointerInsideContainer is true. After clicking the scrollbar (or other non-focusable area), the input blurs, the dropdown stays open, and subsequent outside clicks may not close it because blur no longer fires from the input.

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Suggested fix:** Keep focus on input during list interactions (onmousedown|preventDefault on list container/options), or add an explicit outside-pointer handler to close when open.

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Synthesized from 4 reviews (agents: codex, gemini | types: default, security)

[roborev-ci]

roborev: Combined Review (d179ee1)

Summary Verdict: All agents agree the code is clean and no medium, high, or critical issues were found.

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Synthesized from 4 reviews (agents: codex, gemini | types: default, security)