feat: add Top Skills analytics panel

[charlieviettq]

Summary

• add a full-width Top Skills panel to the Analytics page
• fetch data from GET /api/v1/analytics/skills
• show all-agent skill totals with visible per-agent breakdowns
• keep project breakdown secondary and remove click/search behavior until a backend skill session filter exists

Compatibility

• frontend-only follow-up to feat: add skill usage analytics backend #688
• no backend changes beyond the endpoint introduced in feat: add skill usage analytics backend #688
• UI copy is English

Tests

• cd frontend && npm run check
• cd frontend && npm test -- --run
• git diff --check

Review note

This branch is stacked on #688 (feat: add skill usage analytics backend) because it uses the generated API client for GET /api/v1/analytics/skills. After #688 merges, this PR can be rebased onto upstream main for a cleaner diff.

[roborev-ci]

roborev: Combined Review (c582900)

Verdict: One high-severity regression needs fixing before merge.

High

• frontend/src/lib/components/command-palette/CommandPalette.svelte:136
  The focus effect now reads inputValue, so Svelte reruns it after every input update and calls inputRef.select(). After the first keystroke, the whole query is selected, so the next keystroke replaces it and normal multi-character search input is effectively broken.
  Fix: Only select on initial mount/prefill, for example with a didInitialFocus guard or by reading the initial value outside the reactive effect.

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Panel: ci_default_security | Synthesis: codex, 7s | Members: codex_default (codex/default, done, 4m53s), codex_security (codex/security, done, 1m30s) | Total: 6m30s

[roborev-ci]

roborev: Combined Review (3fd7883)

High issue found: command palette input is effectively broken while typing.

High

• frontend/src/lib/components/command-palette/CommandPalette.svelte:136
  The focus effect now depends on inputValue, so it reruns after every keystroke and re-selects the entire input. This causes the next character typed to replace the previous query text.
  Fix: Only select on initial mount/ref assignment, or read inputValue with untrack so the effect does not rerun on input changes.

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Panel: ci_default_security | Synthesis: codex, 14s | Members: codex_default (codex/default, done, 6m53s), codex_security (codex/security, done, 45s) | Total: 7m52s

[mariusvniekerk]

thats pretty neat.

[mariusvniekerk]

Screenshot of the Top Skills panel using synthetic fixture data: