Proxy GUI pass (#793)

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

Cargo.lock

@@ -11375,6 +11375,8 @@ dependencies = [
  "serde_json",
  "tauri",
  "tauri-build",
+ "tauri-plugin-dialog",
+ "tauri-plugin-opener",
  "tauri-plugin-os",
  "yaak-mac-window",
  "yaak-proxy-lib",
@@ -11765,6 +11767,10 @@ dependencies = [
  "include_dir",
  "libc",
  "log 0.4.34",
+ "objc2 0.6.4",
+ "objc2-app-kit",
+ "objc2-foundation 0.3.2",
+ "plist",
  "r2d2",
  "r2d2_sqlite",
  "reqwest",