A lot of fixes for the app

[memuguenstig-lab]

Summary

This PR fixes the critical settings loading error that occurred when loading settings files and adds comprehensive cross-platform build scripts with automated prerequisite checking.

Fixed Issues

• ✅ Settings loading error (SyntaxError: Unexpected token '<')
• ✅ API endpoint accessibility in development mode
• ✅ Error response format (now returns JSON instead of HTML)
• ✅ UnicodeDecodeError when loading .env file
• ✅ Yarn install peer dependency warnings (dmg-builder, electron-builder-squirrel-windows)
• ✅Added buttons to close the app (why wasnt this in already xd)
• A lot more stuff isnt in this summary, il maybe add it later

Changes Made

• backend/backend.py: Added global HTTPException handler returning JSON responses + UTF-8 encoding for load_dotenv()
• src/services/FileSystemService.ts: Enhanced error handling with content-type validation
• vite.config.ts: Added API endpoint proxy configuration
• package.json: Added missing electron-builder peer dependencies
• App/README.md: Updated with build scripts documentation
• .env: Fixed encoding to proper UTF-8
• New files: build.bat, build.ps1, build.sh, BUILD_SCRIPTS_README.md, PULL_REQUEST.md

New Features

• ✅ Cross-platform build scripts (Windows batch, PowerShell, bash)
• ✅ Automatic prerequisite checking
• ✅ Port conflict detection
• ✅ Enhanced error handling and logging
• ✅ Debug mode support

Testing

• ✅ Settings load successfully
• ✅ API endpoints properly proxied
• ✅ Error messages are helpful
• ✅ Build scripts work on all platforms
• ✅ App starts without UnicodeDecodeError
• ✅ Yarn install runs without peer dependency warnings

Files Changed

• backend/backend.py - Exception handler + env loading fix
• src/services/FileSystemService.ts - Error handling
• vite.config.ts - API proxy configuration
• package.json - Added missing dependencies
• .env - Fixed encoding
• README.md - Documentation updates
• 6 new files (build scripts + documentation)

[f1shyondrugs]

changes look good, i think - i guess it runs 😭