FRE-606: Add Tauri desktop framework with cross-platform support

- Configure Tauri v2 for macOS, Windows, Linux
- Implement native menu bar (File, Edit, View, Window, Help)
- Add system tray with show/hide/quit functionality
- Create auto-updater framework with periodic checks
- Set up window state persistence
- Configure plugins (fs, http, dialog, shell, store)
- Add build scripts for all platforms
- Include comprehensive documentation

Files:
- src-tauri/Cargo.toml
- src-tauri/tauri.conf.json
- src-tauri/build.rs
- src-tauri/src/main.rs
- src-tauri/src/lib.rs
- src-tauri/src/menu.rs
- src-tauri/src/tray.rs
- src-tauri/src/updater.rs
- src-tauri/Cargo.lock
- src-tauri/icons/tray-icon.svg
- src-tauri/tauri.build.conf
- src-tauri/README.md
- .gitignore
- package.json (Tauri CLI scripts)

src-tauri/tauri.build.conf

@@ -0,0 +1,37 @@
+# Tauri Build Configuration
+# This file defines the build settings for cross-platform compilation
+
+[build]
+# Default provider is cargo
+provider = "cargo"
+
+[webview]
+# Webview configuration for different platforms
+# macOS: Uses native WKWebView
+# Windows: Uses WebView2 (Edge)
+# Linux: Uses WebKitGTK
+
+[bundle]
+# Bundle settings for each platform
+
+[bundle.macos]
+# macOS-specific settings
+minimum_system_version = "10.15"
+exception_domain = ""
+entitlements = null
+frameworks = []
+
+[bundle.windows]
+# Windows-specific settings
+webview_install_mode = "DownloadBootstrapper"
+wix = { language = "en-US" }
+nsis = { install_mode = "currentUser" }
+
+[bundle.linux]
+# Linux-specific settings
+deb = { depends = ["libgtk-3-0", "libwebkit2gtk-4.0"] }
+appimage = { bundle_media_info = true }
+
+[dependencies]
+# Platform-specific Rust dependencies
+# These are already in Cargo.toml