feat: harden plugin api for separate repos, signed updates and generic external login

src/ui/plugin-host/testing-host.tsx

@@ -60,6 +60,7 @@ import { ActionSlot, ComponentSlot } from "@/shell/ActionSlot";
 import type { Host, Tab } from "@/types/ui-types";
 import { createPluginApp } from "./app";
 import { installPluginHostBridge, setPluginApiForTesting } from "./bridge";
+import { setRemoteServerUrlForTesting } from "./desktop";
 import { setPluginSummaries, setFrontendState } from "./plugin-store";
 import {
   notifyShellReady,
@@ -81,6 +82,7 @@ function recordingShell(calls: ShellCall[]): TabShellCallbacks {
   return {
     openTab: record("openTab"),
     openSingletonTab: record("openSingletonTab"),
+    connectHost: record("connectHost"),
     closeTab: record("closeTab"),
     renameTab: record("renameTab"),
     openRailView: record("openRailView"),
@@ -187,6 +189,7 @@ export async function renderPlugin(
     pluginId,
     (options.api as Parameters<typeof setPluginApiForTesting>[1]) ?? null,
   );
+  setRemoteServerUrlForTesting(options.remoteServerUrl ?? null);
   const handle = createPluginApp(pluginId, manifest, summary.contributes, {
     guest: options.guest,
   });
@@ -407,6 +410,7 @@ export async function renderPlugin(
         handle.dispose();
         setFrontendState(pluginId, "inactive");
         setPluginApiForTesting(pluginId, null);
+        setRemoteServerUrlForTesting(null);
       }
     },
   };