Add conversation pinning and chat export features

[sillanaresh]

Summary

• Pin/unpin conversations to keep important chats at the top of the sidebar
• Export chats as JSON or Markdown files with proper multi-model support
• Side-by-side format groups AI responses by conversation turns

Changes

Pin Conversations Feature

• Added useTogglePinChat mutation in ChatAPI.ts
• Updated chat list sorting to show pinned chats first
• Added pin/unpin button with icon toggle in sidebar
• Optimistic cache updates for immediate UI feedback

Export Chat Feature

• Created ExportAPI.ts with export functionality
• exportChatAsJSON() - Exports structured JSON with conversation turns
• exportChatAsMarkdown() - Exports readable Markdown with side-by-side AI responses
• Properly handles multi-model chats by grouping responses per message_set
• Added export dropdown menu in chat sidebar (appears on hover)
• Integrated with Tauri file dialogs for save location selection

Test Plan

• Verify pinning a chat moves it to the top of the sidebar
• Verify unpinning a chat returns it to chronological order
• Verify pinned chats persist after app restart
• Hover over any chat in sidebar and verify download icon appears
• Click download icon and select "Export as JSON"
• Verify JSON file is saved with proper structure (turns with user messages and AI responses)
• Click download icon and select "Export as Markdown"
• Verify Markdown file is readable with side-by-side AI responses
• Test export with a multi-model chat (multiple AI responses per turn)
• Verify export handles chats with attachments gracefully
• Verify success/error toasts appear appropriately

🤖 Generated with Claude Code

[greptile-apps]

Additional Comments (1)

1. src/core/chorus/api/ChatAPI.ts, line 138-140 (link)

   logic: Sort order doesn't match the query - needs to sort by pinned first, then updatedAt

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