Improve folder picker path input (#372)

## Summary
- Adds editable path entry directly inside the folder browser dialog
while keeping browse-first behavior.
- Removes the multi-root workspace picker changes from the source
implementation.
- Refines responsive controls so mobile shows the path field first, then
New Folder and Open actions together.

## Credits
- Based on the work and request flow from #350. Thanks to the original
requester and contributor there for the folder picker path input idea.

## Verification
- npm run typecheck --workspace @neuralnomads/codenomad
- npm run typecheck --workspace @codenomad/ui

---------

Co-authored-by: Pascal André <pascalandr@gmail.com>

packages/server/src/index.ts

@@ -317,7 +317,10 @@ async function main() {
     getServerBaseUrl: () => serverMeta.localUrl,
     nodeExtraCaCertsPath,
   })
-  const fileSystemBrowser = new FileSystemBrowser({ rootDir: options.rootDir, unrestricted: options.unrestrictedRoot })
+  const fileSystemBrowser = new FileSystemBrowser({
+    rootDir: options.rootDir,
+    unrestricted: options.unrestrictedRoot,
+  })
   const instanceStore = new InstanceStore(configLocation.instancesDir)
   const speechService = new SpeechService(settings, logger.child({ component: "speech" }))
   const sidecarManager = new SideCarManager({