refactor(aisidebar): restructure project and implement reasoning mode toggle

- Reorganize project structure and file locations
- Add ReasoningController to manage model selection and reasoning mode
- Update design and requirements for reasoning mode toggle
- Implement model switching between Qwen3-4B-Instruct and Qwen3-4B-Thinking models
- Remove deprecated files and consolidate project layout
- Add new steering and specification documentation
- Clean up and remove unnecessary files and directories
- Prepare for enhanced AI sidebar functionality with more flexible model handling

.kiro/steering/tech.md

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+---
+inclusion: always
+---
+
+# Technology Stack
+
+## Framework & Environment
+
+- **Platform**: Ignis desktop environment (Python-based GTK4 framework)
+- **Python Version**: 3.10+
+- **UI Framework**: GTK4 via Ignis widgets
+- **Async/Threading**: GLib for main loop, Python threading for background tasks
+
+## Key Dependencies
+
+- `ignis` - Desktop environment framework providing widgets and window management
+- `ollama` - Python package for Ollama API integration
+- GTK4 (`gi.repository.GLib`) - UI toolkit and event loop
+
+## Architecture Patterns
+
+### Widget System
+- Uses Ignis widget abstractions (`widgets.Box`, `widgets.RevealerWindow`, etc.)
+- Material Design 3 styling via CSS classes
+- Revealer-based slide animations
+
+### API Communication
+- Direct HTTP calls to Ollama REST API (no external HTTP library)
+- Uses `urllib.request` for HTTP operations
+- Timeout handling: 2s for health checks, 5s for model lists, 120s for chat
+
+### State Management
+- Conversation persistence via JSON files
+- Atomic file writes using `tempfile` and `os.replace()`
+- In-memory caching for model lists
+
+### Threading Model
+- UI operations on GLib main thread
+- AI requests in background daemon threads
+- `GLib.idle_add()` for thread-safe UI updates
+
+### Error Handling
+- Graceful degradation when Ollama is unavailable
+- Availability monitoring with 30-second polling interval
+- User-facing error messages instead of exceptions
+
+## Common Commands
+
+Since this is an Ignis module, there are no build/test commands. The module is loaded directly by Ignis:
+
+```bash
+# Reload Ignis to apply changes
+ignis reload
+
+# Run Ignis with console output for debugging
+ignis
+
+# Check Ollama status
+curl http://127.0.0.1:11434/api/tags
+
+# List installed Ollama models
+ollama list
+```