feat: Redesign FloatingTerminal with Windows Vista Aero style

- Slim, transparent Aero Glass design with backdrop blur
- Draggable window from titlebar
- Resizable from corner handle
- Ctrl+E toggle to open at cursor position
- Remove minimize functionality (close returns to sidebar button)
- Add PWA dev-dist files and lock files

frontend/dev-dist/registerSW.js

@@ -0,0 +1 @@
+if('serviceWorker' in navigator) navigator.serviceWorker.register('/dev-sw.js?dev-sw', { scope: '/', type: 'classic' })