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

@@ -0,0 +1,23 @@
+---
+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