MidOrFeed Overlay v1.0.0

fix: update download URLs and electron-builder config

- Fix download URLs to match actual installer filenames (with space)
- Add Apple Silicon detection for automatic macOS arch selection
- Disable auto-publish in electron-builder (no code signing yet)
- Use icon.png instead of icon.ico for Windows build

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>