feat(chat): implement adaptive timeout and enhanced search functionality

- Introduced adaptive timeout logic for web searches and chat streaming, improving responsiveness and efficiency.
- Updated `smartSearchRag` method to support timeout adjustments based on search rounds.
- Enhanced `executeProgressiveSearch` to utilize adaptive timeouts and improve search result handling.
- Added new utility functions for calculating adaptive timeouts based on rounds and attempts.
- Integrated event listeners for chat session management, improving user experience during chat interactions.
- Refactored chat message handling to accommodate new streaming and timeout features.

src-tauri/Cargo.toml

@@ -46,3 +46,4 @@ walkdir = "2.5"
 tauri-plugin-autostart = "2"
 dirs = "5.0"
 rfd = "0.14"
+rusqlite = { version = "0.31", features = ["bundled"] }