fix(desktop): report real hostname/platform/arch in heartbeat

Renderer was registering clients with navigator.platform ("MacIntel") and
a hardcoded "renderer-preview" cpu_arch. Source device info from the main
process (os.hostname + process.platform/arch) via a new device-info IPC,
and let heartbeats always send the authoritative runtime values so stale
registrations self-heal.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/desktop-client/src/renderer/composables/useDesktopSession.ts

@@ -167,12 +167,32 @@ function getOrCreateClientRegistrationID(user: UserInfo): string {
   return generated;
 }
 
-function registerPayload(user: UserInfo): DesktopClientRegisterRequest {
-  return {
-    client_id: getOrCreateClientRegistrationID(user),
+async function resolveDeviceInfo(): Promise<{ device_name: string; os: string; cpu_arch: string }> {
+  const fallback = {
     device_name: `Desktop ${navigator.platform || "unknown"}`,
     os: navigator.platform || "unknown",
-    cpu_arch: "renderer-preview",
+    cpu_arch: "unknown",
+  };
+
+  try {
+    const info = await window.desktopBridge?.app?.deviceInfo?.();
+    if (info?.device_name && info.os && info.cpu_arch) {
+      return info;
+    }
+  } catch (err) {
+    console.warn("[desktop-session] deviceInfo bridge failed", err);
+  }
+
+  return fallback;
+}
+
+async function registerPayload(user: UserInfo): Promise<DesktopClientRegisterRequest> {
+  const device = await resolveDeviceInfo();
+  return {
+    client_id: getOrCreateClientRegistrationID(user),
+    device_name: device.device_name,
+    os: device.os,
+    cpu_arch: device.cpu_arch,
     client_version: "0.1.0-dev",
     channel: "dev",
   };
@@ -193,16 +213,17 @@ function createPreviewUser(): UserInfo {
   };
 }
 
-function createPreviewClient(): DesktopClientInfo {
+async function createPreviewClient(): Promise<DesktopClientInfo> {
   const now = new Date().toISOString();
+  const device = await resolveDeviceInfo();
   return {
     id: "preview-client",
     tenant_id: 0,
     workspace_id: 0,
     user_id: 0,
-    device_name: `Preview ${navigator.platform || "Desktop"}`,
-    os: navigator.platform || "browser",
-    cpu_arch: "renderer-preview",
+    device_name: `Preview ${device.device_name}`,
+    os: device.os,
+    cpu_arch: device.cpu_arch,
     client_version: "0.1.0-preview",
     channel: "dev",
     created_at: now,
@@ -260,7 +281,7 @@ async function login(payload: LoginRequest): Promise<void> {
     const registered = await createAuthenticatedClient().post<
       DesktopClientRegisterResponse,
       DesktopClientRegisterRequest
-    >("/api/desktop/clients/register", registerPayload(authData.user));
+    >("/api/desktop/clients/register", await registerPayload(authData.user));
 
     persistClientRegistrationID(authData.user, registered.client.id);
 
@@ -282,7 +303,7 @@ async function login(payload: LoginRequest): Promise<void> {
   }
 }
 
-function enterPreview(): void {
+async function enterPreview(): Promise<void> {
   error.value = null;
   persistSession({
     mode: "preview",
@@ -291,7 +312,7 @@ function enterPreview(): void {
     user: createPreviewUser(),
     clientToken: "preview-client-token",
     clientTokenExpiresAt: Date.now() + 7 * 24 * 60 * 60 * 1000,
-    desktopClient: createPreviewClient(),
+    desktopClient: await createPreviewClient(),
   });
 }