feat: add About dialog with version and license info

src-tauri/src/lib.rs

@@ -5,10 +5,21 @@
 mod state;
 
 use log::LevelFilter;
+use serde::Serialize;
 use state::{AppState, FrontendState};
 use std::{path::PathBuf, str::FromStr};
 use tauri_plugin_log::{Target, TargetKind};
 
+/// Metadata and legal text displayed by the frontend "About" dialog.
+#[derive(Debug, Clone, Serialize)]
+struct AboutInfo {
+    app_name: String,
+    version: String,
+    identifier: String,
+    license_name: String,
+    license_text: String,
+}
+
 /// Returns the current frontend snapshot without mutating any state. Used for
 /// the initial UI bootstrap.
 #[tauri::command]
@@ -107,6 +118,21 @@ fn reset_stopwatch(app_state: tauri::State<AppState>) -> FrontendState {
     app_state.reset_stopwatch()
 }
 
+/// Returns static application metadata and the bundled MIT license text for
+/// display in the About dialog.
+#[tauri::command]
+fn get_about_info(app: tauri::AppHandle) -> AboutInfo {
+    let package = app.package_info();
+    let identifier = app.config().identifier.clone();
+    AboutInfo {
+        app_name: package.name.clone(),
+        version: package.version.to_string(),
+        identifier,
+        license_name: "MIT".to_string(),
+        license_text: include_str!("../../LICENSE").trim().to_string(),
+    }
+}
+
 /// Initializes the Tauri runtime, configures plugins, and wires shared
 /// application state into every window.
 #[cfg_attr(mobile, tauri::mobile_entry_point)]
@@ -139,7 +165,8 @@ pub fn run() {
             reset_timer,
             toggle_stopwatch,
             add_lap,
-            reset_stopwatch
+            reset_stopwatch,
+            get_about_info
         ])
         .setup(move |_| {
             log::info!("Tauclock backend ready; storage_path={}", storage_display);