feat(deskclaw): rebrand + vibe presets + chat model picker

electron/api/routes/agents.ts

@@ -8,6 +8,7 @@ import {
   removeAgentWorkspaceDirectory,
   resolveAccountIdForAgent,
   updateAgentModel,
+  updateDefaultModel,
   updateAgentName,
 } from '../../utils/agent-config';
 import { deleteChannelAccountConfig } from '../../utils/channel-config';
@@ -135,6 +136,23 @@ export async function handleAgentRoutes(
     return true;
   }
 
+  if (url.pathname === '/api/agents/default-model' && req.method === 'PUT') {
+    try {
+      const body = await parseJsonBody<{ modelRef?: string | null }>(req);
+      const snapshot = await updateDefaultModel(body.modelRef ?? null);
+      try {
+        await syncAllProviderAuthToRuntime();
+      } catch (syncError) {
+        console.warn('[agents] Failed to sync runtime after updating default model:', syncError);
+      }
+      scheduleGatewayReload(ctx, 'update-default-model');
+      sendJson(res, 200, { success: true, ...snapshot });
+    } catch (error) {
+      sendJson(res, 500, { success: false, error: String(error) });
+    }
+    return true;
+  }
+
   if (url.pathname.startsWith('/api/agents/') && req.method === 'PUT') {
     const suffix = url.pathname.slice('/api/agents/'.length);
     const parts = suffix.split('/').filter(Boolean);