feat: adopt new backend api for attachment (#13336)

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

## Summary by CodeRabbit

* **New Features**
* Introduced a new query for applying document updates using AI,
allowing merged markdown responses.
* Added support for an optional file upload field when creating chat
messages.

* **Improvements**
* Enhanced recent Copilot sessions query with pagination by adding an
offset parameter.
* Refined attachment handling in chat responses to better distinguish
between single and multiple file uploads, improving reliability.

* **Bug Fixes**
  * Minor update to error handling for clearer messaging.

* **Chores**
* Cleaned up and updated iOS project configuration files for improved
build consistency.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/frontend/apps/ios/App/Podfile.lock

@@ -45,13 +45,13 @@ EXTERNAL SOURCES:
     :path: "../../../../../node_modules/capacitor-plugin-app-tracking-transparency"
 
 SPEC CHECKSUMS:
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-  CapacitorApp: d63334c052278caf5d81585d80b21905c6f93f39
-  CapacitorBrowser: 081852cf532acf77b9d2953f3a88fe5b9711fb06
+  Capacitor: 03bc7cbdde6a629a8b910a9d7d78c3cc7ed09ea7
+  CapacitorApp: febecbb9582cb353aed037e18ec765141f880fe9
+  CapacitorBrowser: 6299776d496e968505464884d565992faa20444a
   CapacitorCordova: 5967b9ba03915ef1d585469d6e31f31dc49be96f
-  CapacitorHaptics: 70e47470fa1a6bd6338cd102552e3846b7f9a1b3
-  CapacitorKeyboard: 969647d0ca2e5c737d7300088e2517aa832434e2
-  CapacitorPluginAppTrackingTransparency: 2a2792623a5a72795f2e8f9ab3f1147573732fd8
+  CapacitorHaptics: 1f1e17041f435d8ead9ff2a34edd592c6aa6a8d6
+  CapacitorKeyboard: 09fd91dcde4f8a37313e7f11bde553ad1ed52036
+  CapacitorPluginAppTrackingTransparency: 92ae9c1cfb5cf477753db9269689332a686f675a
   CryptoSwift: 967f37cea5a3294d9cce358f78861652155be483
 
 PODFILE CHECKSUM: 2c1e4be82121f2d9724ecf7e31dd14e165aeb082