feat(server): adapt gemini3.1 preview (#14583)

#### PR Dependency Tree


* **PR #14583** 👈

This tree was auto-generated by
[Charcoal](https://github.com/danerwilliams/charcoal)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **New Features**
* Added Gemini 3.1 Pro Preview support (text, image, audio) and new
GPT‑5 variants as defaults; centralized persistent telemetry state for
more reliable client identity.

* **UX**
  * Improved model submenu placement in chat preferences.
* More robust mindmap parsing, preview, regeneration and replace
behavior.

* **Chores**
  * Bumped AI SDK and related dependencies.

* **Tests**
  * Expanded/updated tests and increased timeouts for flaky flows.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/frontend/media-capture-playground/server/gemini.ts

@@ -4,7 +4,7 @@ import {
   type UploadFileResponse,
 } from '@google/generative-ai/server';
 
-const DEFAULT_MODEL = 'gemini-2.0-flash';
+const DEFAULT_MODEL = 'gemini-2.5-pro';
 
 export interface TranscriptionResult {
   title: string;
@@ -75,7 +75,7 @@ Output in JSON format with the following structure:
 export async function gemini(
   audioFilePath: string,
   options?: {
-    model?: 'gemini-2.0-flash' | 'gemini-1.5-flash';
+    model?: 'gemini-2.5-flash' | 'gemini-2.5-pro';
     mode?: 'transcript' | 'summary';
   }
 ) {