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/product.md

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+---
+inclusion: always
+---
+
+# Product Overview
+
+AI Sidebar is a slide-in chat interface for the Ignis desktop environment that provides local AI assistance through Ollama integration.
+
+## Core Features
+
+- Slide-in sidebar from the left side with smooth animations
+- Local AI chat using Ollama models
+- Automatic conversation persistence across sessions
+- Material Design 3 theming that matches Ignis
+- Keyboard shortcut toggle support
+- Automatic Ollama availability monitoring with graceful degradation
+
+## User Experience
+
+- Clicking outside the sidebar closes it (same as QuickCenter)
+- Conversations are automatically saved to `~/.config/ignis/modules/aisidebar/data/conversations/`
+- The UI gracefully handles Ollama being unavailable and notifies users when connectivity is restored
+- Default width is 400px to match QuickCenter

.kiro/steering/structure.md

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+---
+inclusion: always
+---
+
+# Project Structure
+
+## File Organization
+
+```
+aisidebar/
+├── __init__.py              # Module exports (AISidebar class)
+├── aisidebar.py             # Main RevealerWindow implementation
+├── chat_widget.py           # Chat UI widget with message handling
+├── ollama_client.py         # HTTP client for Ollama REST API
+├── ollama_monitor.py        # Availability monitoring with callbacks
+├── conversation_manager.py  # Conversation persistence layer
+└── data/
+    └── conversations/       # JSON conversation files (auto-created)
+        └── default.json     # Default conversation transcript
+```
+
+## Module Responsibilities
+
+### `aisidebar.py`
+- Main window class extending `widgets.RevealerWindow`
+- Handles slide-in animation from left side
+- Manages window visibility and keyboard focus
+- Integrates with Ignis WindowManager
+
+### `chat_widget.py`
+- Complete chat UI implementation
+- Message list rendering and scrolling
+- Input handling and submission
+- Background thread management for AI requests
+- Ollama availability monitoring integration
+
+### `ollama_client.py`
+- Low-level HTTP client for Ollama API
+- Model listing with caching
+- Blocking chat API calls
+- Connection health checking
+- Graceful error handling without exceptions
+
+### `ollama_monitor.py`
+- Periodic availability checking (30s interval)
+- Callback-based state change notifications
+- GLib timeout integration for non-blocking checks
+
+### `conversation_manager.py`
+- JSON-based conversation persistence
+- Atomic file writes for data safety
+- Message validation (system/user/assistant roles)
+- Timestamp tracking for messages
+
+## Naming Conventions
+
+- Private methods/attributes: `_method_name`, `_attribute_name`
+- Widget references: `self._widget_name` (e.g., `self._entry`, `self._message_list`)
+- CSS classes: kebab-case (e.g., `ai-sidebar`, `ai-sidebar-content`)
+- Constants: UPPER_SNAKE_CASE (e.g., `VALID_ROLES`, `DEFAULT_CONVERSATION_ID`)
+
+## Code Style
+
+- Type hints on function signatures
+- Docstrings for classes and public methods
+- Dataclasses for structured data (`ConversationState`)
+- Context managers for file operations
+- Property decorators for computed attributes
+- Threading: daemon threads for background work
+- Error messages: user-friendly with actionable instructions

.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
+```