feat(native/bridge): web fallbacks for all hooks + useNativeTransition page transitions

[mayankmahavar1mg]

---

Description:

## Summary

Two major additions on top of `feature/video_hook_android_ios`:

1. **All 9 native hooks refactored into per-file structure with web fallbacks**
2. **`useNativeTransition` — snapshot overlay page transitions (Android + JS)**

---

## 1. Hooks refactor + web fallbacks

All hooks moved from the monolithic `hooks.js` into `src/native/bridge/hooks/`
with individual files per hook.

**Hooks with web fallbacks added:**
- `useVideoStream` — web: `getUserMedia` stream
- `useCamera` — web: `<input type=file capture=environment>` (no getUserMedia — iOS WebView safe)
- `useFilePicker` — web: `<input type=file>`
- `useDataProtection` — web: localStorage/sessionStorage
- `useHapticFeedback` — web: no-op (API unavailable in browser)
- `useGoogleSignIn` — web: Google Identity Services SDK
- `useIntent` — web: `window.open`
- `useSafeArea` — web: CSS env() vars
- `useNetworkStatus` — web: `navigator.onLine` + Network Information API

**`useNotification` — web fallback intentionally skipped** (Browser Push requires
Service Worker; unreliable in iOS WebView).

**API surface added to every hook:**
```js
const { ..., webFallbackActive, webFallbackDisabled, setWebFallback } = useXxx()

webFallback prop is synchronous source of truth; overrides internal state.

Bug fixes included:

• useBaseHook: isNative detection fixed to use nativeBridge.isAvailable()
  instead of window.WebBridge check (was always false on real Android devices)
• Rules of Hooks violations fixed in useDataProtection, useFilePicker, useCamera
• isNative / isWeb added to thin-state hooks (useSafeArea, useNetworkStatus, useDeviceInfo)
• hooks.js retained as re-export shim for backwards compatibility

---

2. useNativeTransition

Snapshot overlay pattern for native-quality page transitions:

1. JS calls navigate(to, opts) → bridge startTransition
2. Native snapshots current WebView, places bitmap overlay over full screen
3. JS router navigates underneath (snapshot hides the content swap)
4. JS calls commitTransition → native animates overlay out
5. Per-call safety timeout on native auto-commits if JS never calls commit

Web fallback: CSS overlay + requestAnimationFrame double-frame commit.

Android: TransitionManager.kt — Canvas bitmap, ImageView on decorView,
Handler safety timer, slide/fade ObjectAnimator. Bridge wired in
NativeBridge.kt + BridgeUtils.kt.

JS: useNativeTransition.js hook, NativeBridge.js helpers, command
registrations in NativeInterfaces.js.

navigate('/path', {
  type: 'slide',      // 'slide' | 'fade'
  direction: 'left',  // 'left' | 'right'
  duration: 300,
  timeout: 900,       // safety ms, default max(duration*3, 800)
})

iOS implementation complete but not included in this PR (pending iOS-only commit).

---

Files changed

Area	Files
Android	NativeBridge.kt, BridgeUtils.kt, TransitionManager.kt
JS bridge	NativeBridge.js, NativeInterfaces.js, useBaseHook.js
Hooks	hooks/ directory (11 files), hooks.js shim
KB	knowledge-base.json (114 entries)
```

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