Refactor view modules for improved readability and consistency

- Updated markdown rendering logic to use more concise methods for obtaining vector lengths.
- Changed review status display to use the correct flag from settings.
- Cleaned up sidebar rendering code for better formatting and readability.
- Enhanced status bar rendering with improved string formatting and consistent style application.
- Refined workflow panel rendering, ensuring consistent style usage and improved readability.
- Added architecture overview and detailed documentation for backend, data, dependencies, and frontend structures.

src/app/mode/mcp.rs

@@ -1,5 +1,4 @@
 //! MCP mode: overlay for connecting to a configured MCP server.
-
 use crate::app::state::rest::AppStateRest;
 
 /// Placeholder entry point for connecting to an MCP server by name.