feat: AI copilot panel — chat UI with streaming, tool visualization, OAuth settings
Add the XO copilot right-side panel with:
- Pinia store (copilot.store.ts) managing panel state, messages, streaming, and token tracking
- useCopilot composable with mock streaming (30-100ms/word) and context-aware responses
- CopilotPanel: 320px collapsible panel with header, scrollable message list, and input area
- CopilotMessage: markdown rendering (bold, code, lists) with streaming cursor animation
- CopilotToolViz: color-coded tool call cards (green=terminal, yellow=SFTP, blue=RDP)
with pending spinner, done checkmark, expandable input/result JSON
- CopilotSettings: model selector, token usage, clear history, connect/disconnect
- MainLayout integration: ghost icon toggle in toolbar, Ctrl+Shift+K shortcut,
CSS slide transition, content area resizes (not overlay)
All Wails AIService bindings are TODOs with mock behavior. Pure Tailwind CSS,
no external markdown library.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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