v0.1.0: chore: bump version to 0.1.0

🚀 v0.1.0 — UI Redesign
💬 Chat UI
Full-width Message Layout: Assistant messages now expand to full width, while user messages are kept in clean, right-aligned bubbles.

Integrated Model Selector: Moved inside the message input box with a sleek dropdown, active status badge, and smart truncation for long model names.

Unified Input Box: Added a functional bottom toolbar featuring the model selector on the left, with keyboard hints and the send button on the right.

Enhanced Empty State: New icon card and descriptive subtitle for a more welcoming first-run experience.

Input Handling: Fixed a bug where the input height would not reset correctly after sending a message.

📋 Sidebar
New Branding: Added the official logo with a "Sparkles" icon and "Agentic RAG / Powered by AI" branding in the top-left corner.

Refined Thread List: Introduced a "Recent" section label and improved highlighting for the currently active thread.

Theming Support: Implemented a dedicated sidebar background color token (--sidebar) for seamless light and dark mode support.

🛠️ Bug Fixes
API Connectivity: Corrected VITE_API_BASE_URL port mapping (8002 → 8000), restoring functionality for message history and settings loading.