Improvements to Flutter client (#1042)

* Chat improvements

* Delete/reset account via API for Flutter app

* Fix tests.

* Add "contact us" to settings

* Update mobile/lib/screens/chat_conversation_screen.dart

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>
Signed-off-by: Juan José Mata <jjmata@jjmata.com>

* Improve LLM special token detection

* Deactivated user shouldn't have API working

* Fix tests

* API-Key usage

* Flutter app launch failure on no network

* Handle deletion/reset delays

* Local cached data may become stale

* Use X-Api-Key correctly!

---------

Signed-off-by: Juan José Mata <jjmata@jjmata.com>
Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

app/controllers/api/v1/users_controller.rb

@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+
+class Api::V1::UsersController < Api::V1::BaseController
+  before_action :ensure_write_scope
+
+  def reset
+    FamilyResetJob.perform_later(Current.family)
+    render json: { message: "Account reset has been initiated" }
+  end
+
+  def destroy
+    user = current_resource_owner
+
+    if user.deactivate
+      Current.session&.destroy
+      render json: { message: "Account has been deleted" }
+    else
+      render json: { error: "Failed to delete account", details: user.errors.full_messages }, status: :unprocessable_entity
+    end
+  end
+
+  private
+
+    def ensure_write_scope
+      authorize_scope!(:write)
+    end
+end