Fix Desktop to not interfere with FlutterRunner file loading

- Remove sessionStorage reading/clearing from Desktop.openFlutterCodeEditor()
- Remove initialCode prop from FlutterRunner instances
- Let FlutterRunner's polling mechanism handle all file loading
- This fixes public dart files not loading in the editor

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

app/components/Desktop.tsx

@@ -214,14 +214,8 @@ export function Desktop() {
 
 
   const openFlutterCodeEditor = () => {
-    // Check if there's file content stored from File Manager
-    const storedContent = sessionStorage.getItem('flutterFileContent')
-    if (storedContent) {
-      setActiveFlutterApp({ dartCode: storedContent })
-      sessionStorage.removeItem('flutterFileContent') // Clean up
-    } else {
-      setActiveFlutterApp(null) // Use default template
-    }
+    // Don't read/remove sessionStorage here - let FlutterRunner handle it
+    // This allows the polling mechanism in FlutterRunner to detect new files
     setFlutterCodeEditorOpen(true)
     setFlutterCodeEditorMinimized(false)
     bringWindowToFront('flutterCodeEditor')
@@ -895,7 +889,6 @@ export function Desktop() {
                 }}
               >
                 <FlutterRunner
-                  initialCode={activeFlutterApp?.dartCode}
                   onClose={() => {
                     setFlutterRunnerOpen(false)
                     setActiveFlutterApp(null)
@@ -924,7 +917,6 @@ export function Desktop() {
                 }}
               >
                 <FlutterRunner
-                  initialCode={activeFlutterApp?.dartCode}
                   onClose={closeFlutterCodeEditor}
                   onMinimize={() => setFlutterCodeEditorMinimized(true)}
                   onFocus={() => bringWindowToFront('flutterCodeEditor')}