feat: enhance PR handling and UI integration for worktrees

- Added a new route for fetching PR info, allowing users to retrieve details about existing pull requests associated with worktrees.
- Updated the create PR handler to store metadata for existing PRs and handle cases where a PR already exists.
- Enhanced the UI components to display PR information, including a new button to address PR comments directly from the worktree panel.
- Improved the overall user experience by integrating PR state indicators and ensuring seamless interaction with the GitHub CLI for PR management.

apps/ui/src/lib/electron.ts

@@ -1353,6 +1353,17 @@ function createMockWorktreeAPI(): WorktreeAPI {
         },
       };
     },
+
+    getPRInfo: async (worktreePath: string, branchName: string) => {
+      console.log("[Mock] Getting PR info:", { worktreePath, branchName });
+      return {
+        success: true,
+        result: {
+          hasPR: false,
+          ghCliAvailable: false,
+        },
+      };
+    },
   };
 }