Merge branch 'develop' into feat/ai-chat-review-followups

Integrate the already-merged step-limit work from develop. Only conflict was
ai-chat.service.spec.ts: both sides appended a describe block and edited the
import line. Resolved as a union — keep compactToolOutput + the assistantParts/
serializeSteps/rowToUiMessage suites (this branch) AND the prepareAgentStep
suite (develop), importing all symbols from ai-chat.service.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

apps/server/src/integrations/environment/environment.service.ts

@@ -214,6 +214,13 @@ export class EnvironmentService {
     return !this.isCloud();
   }
 
+  isCompactPageTreeEnabled(): boolean {
+    const compactTree = this.configService
+      .get<string>('COMPACT_PAGE_TREE', 'true')
+      .toLowerCase();
+    return compactTree === 'true';
+  }
+
   getStripePublishableKey(): string {
     return this.configService.get<string>('STRIPE_PUBLISHABLE_KEY');
   }

apps/server/src/integrations/static/static.module.ts

@@ -35,6 +35,7 @@ export class StaticModule implements OnModuleInit {
         ENV: this.environmentService.getNodeEnv(),
         APP_URL: this.environmentService.getAppUrl(),
         CLOUD: this.environmentService.isCloud(),
+        COMPACT_PAGE_TREE: this.environmentService.isCompactPageTreeEnabled(),
         FILE_UPLOAD_SIZE_LIMIT:
           this.environmentService.getFileUploadSizeLimit(),
         FILE_IMPORT_SIZE_LIMIT: