feat(hermes): launch dashboard from toolbar when Web UI is offline

When the Hermes Web UI probe fails, the toolbar entry now opens an info
confirm dialog offering to run `hermes dashboard` in the user's preferred
terminal. Accepting spawns it via a temp bash/batch script; `hermes
dashboard` itself opens the browser once ready, so we do not poll.
The Memory panel and Health banner keep the existing toast behavior.

Also corrects the stale `hermes web` hint in the offline toast (the real
command is `hermes dashboard`) and reorders Linux terminal detection to
try `which` before stat'ing /usr/bin, /bin, /usr/local/bin.

src/App.tsx

@@ -46,6 +46,7 @@ import {
   useHermesHealth,
   useOpenHermesWebUI,
 } from "@/hooks/useHermes";
+import { hermesApi } from "@/lib/api/hermes";
 import { useProxyStatus } from "@/hooks/useProxyStatus";
 import { useAutoCompact } from "@/hooks/useAutoCompact";
 import { useLastValidValue } from "@/hooks/useLastValidValue";
@@ -628,7 +629,10 @@ function App() {
     };
   }, []);
 
-  const openHermesWebUI = useOpenHermesWebUI();
+  const [launchDashboardOpen, setLaunchDashboardOpen] = useState(false);
+  const openHermesWebUI = useOpenHermesWebUI(() =>
+    setLaunchDashboardOpen(true),
+  );
 
   const handleOpenWebsite = async (url: string) => {
     try {
@@ -1611,6 +1615,28 @@ function App() {
         onCancel={() => setConfirmAction(null)}
       />
 
+      <ConfirmDialog
+        isOpen={launchDashboardOpen}
+        title={t("hermes.webui.launchConfirmTitle")}
+        message={t("hermes.webui.launchConfirmMessage")}
+        confirmText={t("hermes.webui.launchConfirmAction")}
+        variant="info"
+        onConfirm={() => {
+          setLaunchDashboardOpen(false);
+          void (async () => {
+            try {
+              await hermesApi.launchDashboard();
+              toast.success(t("hermes.webui.launching"));
+            } catch (error) {
+              toast.error(t("hermes.webui.launchFailed"), {
+                description: extractErrorMessage(error) || undefined,
+              });
+            }
+          })();
+        }}
+        onCancel={() => setLaunchDashboardOpen(false)}
+      />
+
       <DeepLinkImportDialog />
       <FirstRunNoticeDialog />
     </div>

src/hooks/useHermes.ts

@@ -155,10 +155,11 @@ export function useToggleHermesMemoryEnabled() {
 
 /**
  * Returns a handler that probes the local Hermes Web UI, opens it in the
- * system browser, and surfaces a localized toast on failure. Callers only
- * need to wire the returned function to a click handler.
+ * system browser, and surfaces a localized toast on failure. When
+ * `onOffline` is provided, it replaces the default offline toast —
+ * callers can use this to open a launch-dashboard confirm dialog instead.
  */
-export function useOpenHermesWebUI() {
+export function useOpenHermesWebUI(onOffline?: () => void) {
   const { t } = useTranslation();
   return useCallback(
     async (path?: string) => {
@@ -167,7 +168,11 @@ export function useOpenHermesWebUI() {
       } catch (error) {
         const detail = extractErrorMessage(error);
         if (detail === HERMES_WEB_OFFLINE_ERROR) {
-          toast.error(t("hermes.webui.offline"));
+          if (onOffline) {
+            onOffline();
+          } else {
+            toast.error(t("hermes.webui.offline"));
+          }
         } else {
           toast.error(t("hermes.webui.openFailed"), {
             description: detail || undefined,
@@ -175,6 +180,6 @@ export function useOpenHermesWebUI() {
         }
       }
     },
-    [t],
+    [t, onOffline],
   );
 }

src/i18n/locales/en.json

@@ -1677,9 +1677,14 @@
     },
     "webui": {
       "open": "Open Hermes Web UI",
-      "offline": "Hermes Web UI is not running. Start it with `hermes web` first.",
+      "offline": "Hermes Web UI is not running. Start it with `hermes dashboard` first.",
       "openFailed": "Failed to open Hermes Web UI",
-      "fixInWebUI": "Fix in Hermes Web UI"
+      "fixInWebUI": "Fix in Hermes Web UI",
+      "launchConfirmTitle": "Hermes Dashboard is not running",
+      "launchConfirmMessage": "Open a terminal and start it now with `hermes dashboard`?\n\nThe browser will open automatically once startup completes.\n\nIf the terminal reports that `hermes` cannot be found or the web extras are missing, run first:\npip install hermes-agent[web]",
+      "launchConfirmAction": "Open terminal & launch",
+      "launching": "Started `hermes dashboard` in a terminal.",
+      "launchFailed": "Failed to open terminal"
     },
     "health": {
       "title": "Hermes config warnings detected",

src/i18n/locales/ja.json

@@ -1677,9 +1677,14 @@
     },
     "webui": {
       "open": "Hermes Web UI を開く",
-      "offline": "Hermes Web UI が起動していません。まず `hermes web` を実行してください。",
+      "offline": "Hermes Web UI が起動していません。まず `hermes dashboard` を実行してください。",
       "openFailed": "Hermes Web UI を開けませんでした",
-      "fixInWebUI": "Hermes Web UI で修正"
+      "fixInWebUI": "Hermes Web UI で修正",
+      "launchConfirmTitle": "Hermes Dashboard が起動していません",
+      "launchConfirmMessage": "ターミナルを開いて `hermes dashboard` を実行しますか？\n\n起動完了後、ブラウザが自動的に開きます。\n\nターミナルに `hermes` が見つからない、または web 依存が不足するというエラーが表示される場合は、まず次を実行してください：\npip install hermes-agent[web]",
+      "launchConfirmAction": "ターミナルを開いて起動",
+      "launching": "ターミナルで hermes dashboard を起動しました。",
+      "launchFailed": "ターミナルを開けませんでした"
     },
     "health": {
       "title": "Hermes 設定の警告を検出",

src/i18n/locales/zh.json

@@ -1677,9 +1677,14 @@
     },
     "webui": {
       "open": "打开 Hermes Web UI",
-      "offline": "Hermes Web UI 未启动，请先运行 `hermes web` 启动服务。",
+      "offline": "Hermes Web UI 未启动，请先运行 `hermes dashboard` 启动服务。",
       "openFailed": "打开 Hermes Web UI 失败",
-      "fixInWebUI": "在 Hermes Web UI 修复"
+      "fixInWebUI": "在 Hermes Web UI 修复",
+      "launchConfirmTitle": "Hermes Dashboard 未启动",
+      "launchConfirmMessage": "是否打开终端并运行 `hermes dashboard` 启动服务？\n\n启动完成后会自动打开浏览器。\n\n若终端提示找不到 hermes 或缺少 web 依赖，请先运行：\npip install hermes-agent[web]",
+      "launchConfirmAction": "打开终端并启动",
+      "launching": "已在终端启动 hermes dashboard",
+      "launchFailed": "打开终端失败"
     },
     "health": {
       "title": "检测到 Hermes 配置警告",

src/lib/api/hermes.ts

@@ -33,6 +33,11 @@ export const hermesApi = {
     await invoke("open_hermes_web_ui", { path: path ?? null });
   },
 
+  /** Open the preferred terminal and run `hermes dashboard` (non-blocking). */
+  async launchDashboard(): Promise<void> {
+    await invoke("launch_hermes_dashboard");
+  },
+
   /**
    * Read one of Hermes' memory blobs (`MEMORY.md` or `USER.md`). Returns an
    * empty string when the file hasn't been created yet.