Implement VSCode-style command palette (Cmd+Shift+P) with comprehensive command organization:
- 19 commands organized into 5 categories: Instance, Session, Agent & Model, Input & Focus, System
- Category-based grouping with proper visual hierarchy
- Keyboard shortcuts displayed for all applicable commands
- Search/filter by command name, description, keywords, or category
Add keyboard shortcuts:
- Cmd+Shift+A: Open agent selector
- Cmd+Shift+M: Open model selector (existing)
- Instance/Session navigation shortcuts (Cmd+[/], Cmd+Shift+[/])
Fix keyboard navigation:
- Model selector now highlights options with arrow keys using data-[highlighted] attribute
- Agent selector properly opens via keyboard shortcut
- Global keyboard handler skips Combobox/Select components to allow native navigation
Improve discoverability:
- Prominent centered Command Palette hint in connection status bar
- Keyboard shortcut hints next to agent and model selectors
Complete task 020-command-palette
- Implement tool-specific rendering for all 14 tool types (read, edit, write, bash, webfetch, todowrite, task, etc.)
- Each tool shows contextually relevant information (file previews, diffs, command output, todo lists)
- Add metadata-driven content display using preview, diff, output, and todos from tool state
- Implement status-based rendering (pending, running, completed, error) with animations
- Create global state store for expandable items (tool calls and reasoning sections)
- Fix state persistence: expanded tool calls and reasoning sections remain expanded when new messages arrive
- Fix scroll position preservation during live message updates
- Fix reasoning toggle loop by replacing native details element with custom expandable
- Add comprehensive documentation in TOOL_CALL_IMPLEMENTATION.md
- Reduce font sizes for better readability in expanded tool content
- Add proper keying to For loops to prevent component recreation
- Match TUI patterns for tool names, actions, and content formatting
