Complete UI design like screenshots of T3 Code

[StickyCoolDev]

Left to implement

1. Header in /src/App.tsx : add a header that shows the last prompt and and a badge that shows the current open project . And also add a open in [ide] button. For this to work we need to imrpment deeplinking Which will include:
   • Cursor (cursor://)
   • VSCode (vscode://)
   • Windsurf (wind://)
     As all are vscode oss, they use scheme://fiile/{path to file }
2. Add actions : this is a unknown button that is seen in the header.
3. Add markdown renderer and code renderer. : the code veiwer will also have seen to have a "View Diff" button.