feat(version): enhance version detection and display across sidecar and binary installations

- Implement regex-based version extraction for more reliable parsing
- Add version detection for bundled sidecar installations with proper execution
- Improve version checking for sidecar binary with timeout and error handling
- Update UI to display version with "v" prefix for consistency
- Add comprehensive logging for version detection debugging
- Handle edge cases in version extraction with fallback mechanisms

src/components/Topbar.tsx

@@ -112,7 +112,7 @@ export const Topbar: React.FC<TopbarProps> = ({
           />
           <span>
             {versionStatus.is_installed && versionStatus.version
-              ? `Claude Code ${versionStatus.version}`
+              ? `Claude Code v${versionStatus.version}`
               : "Claude Code"}
           </span>
         </div>