feat(commands): app_info (version+commit) and open_url for the About page

src-tauri/src/commands.rs

@@ -834,6 +834,42 @@ pub async fn map_speaker_to_participant(
     Ok(())
 }
 
+// ---- App metadata (About page) ----
+
+/// Version + build commit for the About page. Version comes from Cargo; the
+/// short commit hash is baked in at build time by `build.rs` (`WA_GIT_HASH`).
+#[tauri::command]
+pub async fn app_info() -> WaResult<serde_json::Value> {
+    Ok(serde_json::json!({
+        "version": env!("CARGO_PKG_VERSION"),
+        "commit": env!("WA_GIT_HASH"),
+    }))
+}
+
+/// Opens an http(s) URL in the user's default browser (About page source link).
+/// Windows-only (WA is Windows-native, ADR-0001). The scheme is validated so
+/// this can't be coerced into launching a local path or program, and `explorer`
+/// receives the URL as a single argv (no shell), so there's no injection surface.
+#[tauri::command]
+pub async fn open_url(url: String) -> WaResult<()> {
+    if !(url.starts_with("https://") || url.starts_with("http://")) {
+        return Err(WaError::new("app", "only http(s) URLs may be opened"));
+    }
+    #[cfg(windows)]
+    {
+        std::process::Command::new("explorer")
+            .arg(&url)
+            .spawn()
+            .map_err(|e| WaError::new("app", e.to_string()))?;
+        Ok(())
+    }
+    #[cfg(not(windows))]
+    {
+        let _ = url;
+        Err(WaError::new("app", "unsupported platform"))
+    }
+}
+
 // ---- Hardware + models (Phase 3) ----
 
 #[tauri::command]