Add chat reliability diagnostics and markdown timeline refinements

[arpan404]

Summary

• Restructures the desktop application menu into clearer product areas for chat, agents, projects, connections, and tools, and updates menu actions to match the new organization.
• Adds reliability UX across chat: provider refresh actions, diagnostics entry points, stuck-turn hints, and a dedicated diagnostics dialog for connection, provider, and thread state.
• Refines chat rendering and timeline spacing, including smaller text rhythm, clearer thinking summaries, and preserved fallback link text inside markdown lists.
• Bumps app versions to 0.2.1 and wires server/runtime changes needed for provider session directory reuse.

Testing

• apps/desktop/src/applicationMenu.test.ts updated to verify the new menu structure and action wiring.
• apps/web/src/components/ChatMarkdown.test.tsx updated to verify fallback link text remains visible in list items.
• apps/web/src/components/chat/MessagesTimeline.test.tsx updated to verify the new thinking summary copy.
• Not run: bun fmt
• Not run: bun lint
• Not run: bun typecheck
• Not run: bun run test

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Project	Deployment	Actions	Updated (UTC)
ace-marketing	Ready	Preview, Comment	May 22, 2026 6:58am