Major UI/tooling updates:
- Rewrite Tooltip API and internals: accept opts object, use portal parent, simplify positioning logic, improve observers and event handling (pointer-based), stricter typing, and various lifecycle fixes.
- Update SubtitlesWidget to use PointerEvent, add global pointerdown to dismiss tooltips, fix tooltip mount/update flows and related event handling.
- Style adjustments: .vot-portal display -> contents and simplify overlay pointer-events so interactive controls receive events.
- UI tweaks: stopPropagation on dialog backdrop click, remove mousedown listeners where unnecessary, refine overlay view reparenting and menu listeners.
- OverlayVisibilityController: improved pointer path checks, immediate hide() method, touch-specific behavior and activity handling fixes.
- FullscreenHelper: prefer video rect when determining container size.
- Move Vite config files into vite/ subdirectory and update package.json and imports (paths updated and rootDir adjusted).
These changes consolidate tooltip/overlay behavior around pointer events, tidy DOM mounting, and reorganize build configs.
