fix(tauri): use raw __TAURI_INTERNALS__ invoke, fix dynamic import on Android

Root cause: dynamic import('@tauri-apps/plugin-opener') silently fails on
Android Tauri WebView because the module resolution path for @tauri-apps/api
(plugin dependency) differs from npm expectations in the bundled context.

Rewrote tauri.ts to use window.__TAURI_INTERNALS__.invoke() directly:
- openUrl() → invoke('plugin:opener|open_url', {url})
- setupDeepLinkHandler() → invoke('plugin:deep-link|get_current')
- Warm-start listener still uses import('@tauri-apps/api/event') for
  deep-link://new-url events (bundled as separate chunk by Vite)
- Added @tauri-apps/api as direct dependency

Also kept withGlobalTauri: true (needed for __TAURI_INTERNALS__ injection)
but reverted APK frontendDist back to bundled React app (../web/dist)
since redirect-to-live-web approach was unreliable.

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

apps/tauri/tauri.conf.json

@@ -4,10 +4,10 @@
   "version": "0.1.0",
   "identifier": "com.zeavis.edu",
   "build": {
-    "frontendDist": "../web/dist-tauri",
+    "frontendDist": "../web/dist",
     "devUrl": "http://localhost:5173",
-    "beforeBuildCommand": "echo 'Nothing to build (APK loads live web content)'",
-    "beforeDevCommand": "echo 'Dev mode - connect to localhost:5173'"
+    "beforeBuildCommand": "cd ../web && bun run build",
+    "beforeDevCommand": "cd ../web && bun run dev"
   },
   "app": {
     "withGlobalTauri": true,