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)

src-tauri/Cargo.lock

@@ -18,6 +18,7 @@ dependencies = [
  "tauri-build",
  "tauri-plugin-clipboard-manager",
  "tauri-plugin-dialog",
+ "tauri-plugin-global-shortcut",
  "tauri-plugin-http",
  "tauri-plugin-notification",
  "tauri-plugin-store",
@@ -1487,6 +1488,24 @@ version = "0.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0cc23270f6e1808e30a928bdc84dea0b9b4136a8bc82338574f23baf47bbd280"
 
+[[package]]
+name = "global-hotkey"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b9247516746aa8e53411a0db9b62b0e24efbcf6a76e0ba73e5a91b512ddabed7"
+dependencies = [
+ "crossbeam-channel",
+ "keyboard-types",
+ "objc2",
+ "objc2-app-kit",
+ "once_cell",
+ "serde",
+ "thiserror 2.0.18",
+ "windows-sys 0.59.0",
+ "x11rb",
+ "xkeysym",
+]
+
 [[package]]
 name = "gobject-sys"
 version = "0.18.0"
@@ -4097,6 +4116,7 @@ dependencies = [
  "gtk",
  "heck 0.5.0",
  "http",
+ "image",
  "jni",
  "libc",
  "log",
@@ -4266,6 +4286,21 @@ dependencies = [
  "url",
 ]
 
+[[package]]
+name = "tauri-plugin-global-shortcut"
+version = "2.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "424af23c7e88d05e4a1a6fc2c7be077912f8c76bd7900fd50aa2b7cbf5a2c405"
+dependencies = [
+ "global-hotkey",
+ "log",
+ "serde",
+ "serde_json",
+ "tauri",
+ "tauri-plugin",
+ "thiserror 2.0.18",
+]
+
 [[package]]
 name = "tauri-plugin-http"
 version = "2.5.7"
@@ -6009,6 +6044,12 @@ version = "0.13.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ea6fc2961e4ef194dcbfe56bb845534d0dc8098940c7e5c012a258bfec6701bd"
 
+[[package]]
+name = "xkeysym"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b9cc00251562a284751c9973bace760d86c0276c471b4be569fe6b068ee97a56"
+
 [[package]]
 name = "yoke"
 version = "0.8.1"