Add session search, tags, and archive controls

[slashdevcorpse]

Summary

• Add local session tags, archive state, failed-run metadata, and server-side full-text search across session titles, message text, and command output summaries.
• Add session metadata client helpers, tag editing, archive/unarchive controls, and an archived section in the sidebar.
• Replace the session command palette search with server-backed search and saved filters for workspace, pinned, recent, failed, tagged, and archived sessions.

Testing

• pnpm -C apps/codex-claw lint
• pnpm -C apps/codex-claw test
• pnpm -C apps/codex-claw build

Notes

• pnpm -C apps/codex-claw exec tsc --noEmit still reports existing type errors in message-item, workspace settings, codex-cli run profile typing, and git-review state typing; the Feature: session search, tags, archive, and saved filters #90-specific errors found during validation were fixed.

Closes #90

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Summary by cubic

Adds server-backed session search, tags, and archive controls to help organize and find sessions faster. Closes #90 by delivering full-text search, tagging, archived views, and saved filters across the app.

• New Features
  • API: GET /api/sessions now supports q, filter, tag, and includeArchived; PATCH /api/sessions accepts tags and archived.
  • Search: Full-text across titles, messages, and tool outputs with filters for workspace, pinned, recent, failed, tagged, and archived (server-backed except pinned).
  • Metadata: Normalize and persist tags; track archived and hasFailedRun; expose via SessionMeta.
  • UI: Tag editor dialog, archive/unarchive actions, archived section in the sidebar, and badges for tags/archived/failed.
  • Command Palette: Replaced local search with server-backed results, added filter pills, and status messages.
  • Client: useSessionMetadata for optimistic updates; new query keys and helpers; sidebar fetch includes archived for proper grouping.

^{Written for commit b51dd60. Summary will update on new commits.}

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[cubic-dev-ai]

No issues found across 12 files

_{Re-trigger cubic}