feat(matting): hide enable on unsupported platforms

Query matting_supported and show 'not available on this platform'
instead of an Enable button when there is no official prebuilt runtime,
so the user can't start a download that would only fail.

Author: qianmoQ

app/src-tauri/src/lib.rs

@@ -1308,6 +1308,12 @@ async fn put_image_bytes(
         .map_err(|e| e.to_string())
 }
 
+/// 当前平台 / 架构是否支持 AI 抠图(有官方预编译运行时可下载)。
+#[tauri::command]
+fn matting_supported(state: State<'_, App>) -> bool {
+    state.matting_supported()
+}
+
 /// AI 抠图插件是否已安装。
 #[tauri::command]
 fn matting_installed(state: State<'_, App>) -> bool {
@@ -1545,6 +1551,7 @@ pub fn run() {
             image_edit_full,
             put_image_bytes,
             save_image_bytes_local,
+            matting_supported,
             matting_installed,
             install_matting_plugin,
             uninstall_matting_plugin,

app/src/api.ts

@@ -422,6 +422,8 @@ export const setPref = (key: string, value: string) =>
   invoke<void>("set_pref", { key, value });
 
 // AI 抠图插件(去背景)
+export const mattingSupported = () => invoke<boolean>("matting_supported");
+
 export const mattingInstalled = () => invoke<boolean>("matting_installed");
 
 export const installMattingPlugin = () =>

app/src/components/MattingPluginCard.tsx

@@ -10,6 +10,7 @@ import { useI18n } from "../i18n";
  */
 export function MattingPluginCard() {
   const { t } = useI18n();
+  const [supported, setSupported] = useState(true);
   const [installed, setInstalled] = useState<boolean | null>(null);
   const [busy, setBusy] = useState(false);
   const [progress, setProgress] = useState<{ done: number; total: number } | null>(
@@ -20,6 +21,7 @@ export function MattingPluginCard() {
   const unlisten = useRef<(() => void) | null>(null);
 
   useEffect(() => {
+    api.mattingSupported().then(setSupported).catch(() => setSupported(true));
     api.mattingInstalled().then(setInstalled).catch(() => setInstalled(false));
     return () => unlisten.current?.();
   }, []);
@@ -72,7 +74,10 @@ export function MattingPluginCard() {
             {t("下载本地模型,一键去掉图片背景。约 20 MB,首次需下载。")}
           </div>
         </div>
-        {installed === false && !busy && (
+        {!supported && (
+          <span className="plugin-card__state">{t("本平台暂不支持")}</span>
+        )}
+        {supported && installed === false && !busy && (
           <button className="btn btn--primary" onClick={install}>
             {t("启用")}
           </button>

app/src/translations/en.ts

@@ -254,6 +254,7 @@ export const EN: Record<string, string> = {
     "Download a local model to cut out backgrounds. ~20 MB, downloaded once.",
   启用: "Enable",
   卸载: "Uninstall",
+  本平台暂不支持: "Not available on this platform",
   "安装完成,重启应用后生效。": "Installed — restart the app to take effect.",
   立即重启: "Restart now",
 

app/src/translations/ja.ts

@@ -94,6 +94,7 @@ export const JA: Record<string, string> = {
     "ローカルモデルをダウンロードして背景をワンクリックで除去。約 20 MB、初回のみダウンロード。",
   启用: "有効化",
   卸载: "アンインストール",
+  本平台暂不支持: "このプラットフォームでは利用できません",
   "安装完成,重启应用后生效。": "インストール完了 — アプリを再起動すると有効になります。",
   立即重启: "今すぐ再起動",
 };

crates/app-core/src/matting_plugin.rs

@@ -106,6 +106,11 @@ impl App {
         self.matting_dir().map(|d| d.join(dylib_name()))
     }
 
+    /// 当前平台 / 架构是否有官方预编译运行时可下载(决定是否显示「启用」)。
+    pub fn matting_supported(&self) -> bool {
+        runtime_archive().is_some()
+    }
+
     /// 插件是否已安装(模型 + 运行时库都在)。
     pub fn matting_installed(&self) -> bool {
         matches!(