[DhruvilPatel603]

Summary

Resolves #258.

Adds support for starting Plexo minimized to the system tray and launching automatically at system startup across Windows, macOS, and Linux.

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Key Changes

1. Settings UI (Speed & Data Limits / General):

   • Added "Launch on startup" switch: automatically opens Plexo on system boot.
   • Added "Start minimized" switch: opens Plexo in the system tray without popping up the main window.
   • Settings persist to app-settings.json and reset cleanly with "Reset to defaults".

2. Cross-Platform Autostart Support (src/main/autostart.ts):

   • Windows: Uses Electron's native app.setLoginItemSettings passing --minimized when start-minimized is enabled.
   • macOS: Uses app.setLoginItemSettings({ openAtLogin }).
   • Linux: Manages standard XDG Autostart entry at ~/.config/autostart/plexo.desktop (supporting both installed binary and AppImage via process.env.APPIMAGE || process.execPath).

3. Minimized Startup & Tray Handling (src/main/index.ts):

   • Supports CLI flags (--minimized, --start-minimized, --hidden) as well as the saved settings.startMinimized preference.
   • When launching minimized, keeps the window hidden on ready-to-show and initializes the system tray icon immediately.
   • Clicking the tray icon, launching a second instance, or receiving a download link (from the browser extension or CLI) smoothly brings the window forward.

4. Testing (e2e/startup.spec.ts):

   • Tagged with @smoke for CI execution.
   • Uses exact Playwright locators to prevent ambiguous element matching.
   • Tests settings persistence across relaunches, UI switch interactions, default reset behavior, and minimized CLI launch.

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Verification

• npm run typecheck passes (0 errors across node, web, e2e, and extension)
• npm run lint passes (0 errors)
• npm run format:check clean
• E2E startup test suite added