fix(browser): preserve chat focus during agent browsing

electron/coding-runtime/pi/extensions/agent-browser.ts

@@ -119,7 +119,9 @@ export class PiAgentBrowserTool {
       });
       const runKey = `${context.conversationId}:${context.runId}`;
       this.diagnosticRuns.set(runKey, { projectPath: context.projectPath, owner });
-      if (this.requestPresentation) {
+      // Only a new viewport needs foreground presentation. Reusing an initialized
+      // page must respect the user's selected tab, including while navigating.
+      if (this.requestPresentation && !snapshot.bounds) {
         try {
           this.requestPresentation(snapshot);
           snapshot = await this.browser.waitForPresentation({
@@ -139,6 +141,8 @@ export class PiAgentBrowserTool {
           }
           throw error;
         }
+      } else {
+        this.publishState?.(snapshot);
       }
       return result(action, publicSnapshot(snapshot));
     }