Fix: Ensure file upload compatibility across all browsers

[Copilot]

Problem

The TaskHub application was previously only functional in browsers supporting the File System Access API (Chrome, Edge), effectively blocking users on Firefox, Safari, and other browsers. Users would see a warning message stating the app was incompatible with their browser.

Solution

Implemented a hybrid file system approach that automatically detects browser capabilities and seamlessly switches between modern and fallback file operations:

Modern Browsers (Chrome, Edge)

• Uses File System Access API for direct file system integration
• Auto-saving with persistent file handles
• No downloads folder clutter

Legacy Browsers (Firefox, Safari, others)

• Uses traditional <input type="file"> for opening files
• Downloads files to default download folder
• Clear user feedback about compatibility mode
• Added download button for manual file saving

Key Changes

1. Cross-Browser File Utilities (FileUtils.ts)

export const isFileSystemAccessSupported = (): boolean => {
  return 'showOpenFilePicker' in window && 'showSaveFilePicker' in window;
};

export const downloadFile = (content: string, filename: string) => {
  // Creates blob and triggers download for fallback mode
};

export const createFileInput = (accept: string): Promise<FileList | null> => {
  // Creates traditional file input for opening files
};

2. Hybrid File Service (FileService.ts)

• Automatic Detection: Detects browser capabilities on initialization
• Modern Mode: Uses File System Access API when available
• Fallback Mode: Uses traditional file input/download when needed
• Seamless Switching: No user action required

3. Updated UI (FileSelector.tsx)

• Smart Messaging: Shows "Compatibility Mode" instead of warning
• Context-Aware Controls: Displays appropriate buttons for each mode
• Download Button: Added for fallback mode file saving
• Improved Styling: Better visual feedback for both modes

Benefits

✅ Universal Compatibility: Now works on all modern browsers
✅ Seamless Experience: Automatic mode detection and switching
✅ No Breaking Changes: Existing Chrome/Edge users unaffected
✅ Full Functionality: All features work in both modes
✅ Better UX: Clear messaging instead of blocking warnings

Testing

• ✅ Build successfully compiles
• ✅ Modern mode tested with File System Access API
• ✅ Fallback mode tested with file download/upload
• ✅ Task creation and file operations work in both modes
• ✅ Downloaded files contain correct JSON structure

Files Modified

• src/app/utils/FileUtils.ts - New cross-browser file utilities
• src/app/services/FileService.ts - Hybrid file service implementation
• src/app/components/FileSelector/component.tsx - Updated UI with fallback support
• src/app/components/FileSelector/style.css - Enhanced styling for new elements

Result: File upload now works on every browser with an optimal experience tailored to each platform's capabilities.

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