feat: Transform to Tauri desktop app

- Initialize Tauri v2 project with Rust backend
- Restructure project: move source files to src/ directory
- Add Tauri configuration for Windows, macOS, and Linux builds
- Update Vite config for Tauri development workflow
- Add file system and dialog permissions for native features
- Update package.json with desktop build scripts
- Update tsconfig.json paths for new src structure
- Add Tauri and desktop badges to README
- Document desktop build process and architecture

src-tauri/src/lib.rs

@@ -0,0 +1,26 @@
+use tauri::Manager;
+
+#[cfg_attr(mobile, tauri::mobile_entry_point)]
+pub fn run() {
+  tauri::Builder::default()
+    .plugin(tauri_plugin_dialog::init())
+    .plugin(tauri_plugin_fs::init())
+    .setup(|app| {
+      // Show the main window after setup
+      if let Some(window) = app.get_webview_window("main") {
+        let _ = window.show();
+        let _ = window.set_focus();
+      }
+
+      if cfg!(debug_assertions) {
+        app.handle().plugin(
+          tauri_plugin_log::Builder::default()
+            .level(log::LevelFilter::Info)
+            .build(),
+        )?;
+      }
+      Ok(())
+    })
+    .run(tauri::generate_context!())
+    .expect("error while running tauri application");
+}

src-tauri/src/main.rs

@@ -0,0 +1,6 @@
+// Prevents additional console window on Windows in release, DO NOT REMOVE!!
+#![cfg_attr(not(debug_assertions), windows_subsystem = "windows")]
+
+fn main() {
+  app_lib::run();
+}