Fix file loading to prevent overwriting clicked file

- Create loadAllFilesForTree() that loads file tree without changing active file
- Use loadAllFilesForTree() instead of loadFiles() when opening a specific file
- Prevents secure files from being overwritten by the first file in the list
- Public files show simple file structure, secure files show all dart files
- Both secure and public files now load correctly

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

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

app/components/FlutterRunner.tsx

@@ -42,7 +42,68 @@ export function FlutterRunner({ onClose, onMinimize, onMaximize, onFocus, zIndex
   const [passkey, setPasskey] = useState('')
   const [loading, setLoading] = useState(false)
 
-  // Load files from secure storage
+  // Load all files for the file tree without changing the active file
+  const loadAllFilesForTree = async (key: string, currentFileName: string) => {
+    try {
+      const response = await fetch(`/api/data?key=${encodeURIComponent(key)}&folder=`)
+      const data = await response.json()
+
+      if (data.error) {
+        throw new Error(data.error)
+      }
+
+      // Filter for .dart files
+      const dartFiles = data.files?.filter((f: any) => f.name.endsWith('.dart')) || []
+
+      if (dartFiles.length > 0) {
+        const fileNodes: FileNode[] = dartFiles.map((file: any, index: number) => ({
+          id: `file_${index}`,
+          name: file.name,
+          type: 'file' as const,
+          content: file.content
+        }))
+
+        setFiles([{
+          id: 'root',
+          name: 'Dart Files',
+          type: 'folder',
+          isOpen: true,
+          children: fileNodes
+        }])
+
+        // Set active file ID to match the current file
+        const currentFileNode = fileNodes.find(f => f.name === currentFileName)
+        if (currentFileNode) {
+          setActiveFileId(currentFileNode.id)
+        }
+      } else {
+        // No files found, just show the current file
+        setFiles([{
+          id: 'root',
+          name: 'lib',
+          type: 'folder',
+          isOpen: true,
+          children: [
+            { id: 'main', name: currentFileName, type: 'file', content: '' }
+          ]
+        }])
+      }
+    } catch (err) {
+      console.error('Error loading file tree:', err)
+      // On error, just show the current file
+      setFiles([{
+        id: 'root',
+        name: 'lib',
+        type: 'folder',
+        isOpen: true,
+        children: [
+          { id: 'main', name: currentFileName, type: 'file', content: '' }
+        ]
+      }])
+    }
+  }
+
+  // Load files from secure storage (used when no specific file is selected)
   const loadFiles = async (key: string) => {
     setLoading(true)
     try {
@@ -133,20 +194,22 @@ export function FlutterRunner({ onClose, onMinimize, onMaximize, onFocus, zIndex
 
       if (sessionPasskey) {
         setPasskey(sessionPasskey)
-        loadFiles(sessionPasskey)
+        // Don't call loadFiles here - it would overwrite the file we just loaded
+        // Just load all files for the file tree without changing the active file
+        loadAllFilesForTree(sessionPasskey, sessionFileName || 'main.dart')
+      } else {
+        // For public files, just set up a simple file structure
+        setFiles([{
+          id: 'root',
+          name: 'lib',
+          type: 'folder',
+          isOpen: true,
+          children: [
+            { id: 'main', name: sessionFileName || 'main.dart', type: 'file', content: sessionFileContent }
+          ]
+        }])
       }
 
-      // Set up file structure
-      setFiles([{
-        id: 'root',
-        name: 'lib',
-        type: 'folder',
-        isOpen: true,
-        children: [
-          { id: 'main', name: sessionFileName || 'main.dart', type: 'file', content: sessionFileContent }
-        ]
-      }])
-
       // Clear session storage after loading
       sessionStorage.removeItem('flutterFileContent')
     } else if (sessionPasskey) {
@@ -182,19 +245,21 @@ export function FlutterRunner({ onClose, onMinimize, onMaximize, onFocus, zIndex
 
         if (sessionPasskey) {
           setPasskey(sessionPasskey)
+          // Load all files for the file tree without overwriting the current file
+          loadAllFilesForTree(sessionPasskey, sessionFileName || 'main.dart')
+        } else {
+          // For public files, just set up a simple file structure
+          setFiles([{
+            id: 'root',
+            name: 'lib',
+            type: 'folder',
+            isOpen: true,
+            children: [
+              { id: 'main', name: sessionFileName || 'main.dart', type: 'file', content: sessionFileContent }
+            ]
+          }])
         }
 
-        // Update file structure
-        setFiles([{
-          id: 'root',
-          name: 'lib',
-          type: 'folder',
-          isOpen: true,
-          children: [
-            { id: 'main', name: sessionFileName || 'main.dart', type: 'file', content: sessionFileContent }
-          ]
-        }])
-
         // Clear session storage after loading
         sessionStorage.removeItem('flutterFileContent')
       }