feat: Add PWA support, launchd service, and simplify minimap toggle

feat: Add collapsible sidebar and minimap with configurable display modes and UI controls.

refactor: use ReactFlow state hooks in ConversationTree and redesign NodeDetail's UI.

feat: use the first encountered timestamp as a fallback for a conversation's first timestamp.

refactor: Force ReactFlow component remount on conversation data changes to ensure reliable node and edge rendering.

feat: Migrate client, server, and shared codebases to TypeScript, update dependencies, and refactor client components.

Initial commit: Claude Conversation Manager (CCM)