feat: compact boundary divider, overlay fix, approval window, PiP, Tauri enhancements

- Add CompactBoundaryDivider component for compact_boundary system messages
- Fix readability overlay: v-if removes element entirely at 0% opacity
- Add approval page and window composable
- Add PiP window support and loading screen
- Tauri: add window management commands and capabilities
- Disable Ctrl+1..5 shortcuts in Tauri (handled by global shortcuts)

frontend/package-lock.json

@@ -12,6 +12,7 @@
         "@tauri-apps/api": "^2.10.1",
         "@tauri-apps/plugin-clipboard-manager": "^2.3.2",
         "@tauri-apps/plugin-dialog": "^2.6.0",
+        "@tauri-apps/plugin-global-shortcut": "^2.3.1",
         "@tauri-apps/plugin-http": "^2.5.7",
         "@tauri-apps/plugin-notification": "^2.3.3",
         "@tauri-apps/plugin-store": "^2.4.2",
@@ -2667,6 +2668,15 @@
         "@tauri-apps/api": "^2.8.0"
       }
     },
+    "node_modules/@tauri-apps/plugin-global-shortcut": {
+      "version": "2.3.1",
+      "resolved": "https://registry.npmjs.org/@tauri-apps/plugin-global-shortcut/-/plugin-global-shortcut-2.3.1.tgz",
+      "integrity": "sha512-vr40W2N6G63dmBPaha1TsBQLLURXG538RQbH5vAm0G/ovVZyXJrmZR1HF1W+WneNloQvwn4dm8xzwpEXRW560g==",
+      "license": "MIT OR Apache-2.0",
+      "dependencies": {
+        "@tauri-apps/api": "^2.8.0"
+      }
+    },
     "node_modules/@tauri-apps/plugin-http": {
       "version": "2.5.7",
       "resolved": "https://registry.npmjs.org/@tauri-apps/plugin-http/-/plugin-http-2.5.7.tgz",