fix: multiple UI and API issues

- Fix tool calls format for DeepSeek API (add type field)

- Fix config event handler name

- Fix message history display (preserve all messages)

- Fix right panel width and scrolling

- Add async config update to prevent UI freeze

- Add prompt caching with singleton pattern

- Update build scripts with complete hidden imports

ui/widgets/right_panel.py

@@ -35,7 +35,7 @@ class RightPanel(Container):
             self.styles.width = 0
             self.styles.display = "none"
         else:
-            self.styles.width = 70
+            self.styles.width = 35
             self.styles.display = "block"
 
     def is_collapsed(self) -> bool: