feat: move termix identity into a plugin (C6)

src/ui/plugin-host/app.ts

@@ -42,6 +42,8 @@ import {
 } from "./auth-registry";
 import { pluginHostBridge, resolvePluginPermission } from "./bridge";
 import { shell, tabsApi } from "./shell-bridge";
+import { onRemoteServerChange, remoteServerUrl } from "./desktop";
+import { isElectron } from "@/lib/electron";
 import { withPluginScope } from "./scope";
 import { manifestDeclares, type ViewKind } from "./view-ownership";
 import { pluginKey } from "@/lib/plugin-i18n";
@@ -407,6 +409,12 @@ export function createPluginApp(
       onReady: (listener) => track(tabsApi.onReady(listener)),
     },
 
+    desktop: {
+      available: isElectron(),
+      remoteServerUrl,
+      onRemoteServerChange: (listener) => track(onRemoteServerChange(listener)),
+    },
+
     onDispose(dispose) {
       if (disposed) {
         dispose();

src/ui/plugin-host/desktop.ts

@@ -0,0 +1,24 @@
+/** app.desktop: the desktop app's remote sync connection, for plugins. */
+
+import { isElectron } from "@/lib/electron";
+
+export async function remoteServerUrl(): Promise<string | null> {
+  if (!isElectron()) return null;
+  try {
+    const config = (await window.electronAPI?.invoke?.(
+      "get-remote-sync-config",
+    )) as { serverUrl?: string } | null | undefined;
+    return config?.serverUrl || null;
+  } catch {
+    return null;
+  }
+}
+
+export function onRemoteServerChange(listener: () => void): () => void {
+  const unsubscribe = window.electronAPI?.onRemoteSyncStatusChanged?.(() =>
+    listener(),
+  );
+  return () => {
+    if (typeof unsubscribe === "function") unsubscribe();
+  };
+}