Pre-launch design sync with Figma spec (#2154)

* Add lookbook + viewcomponent, organize design system file

* Build menu component

* Button updates

* More button fixes

* Replace all menus with new ViewComponent

* Checkpoint: fix tests, all buttons and menus converted

* Split into Link and Button components for clarity

* Button cleanup

* Simplify custom confirmation configuration in views

* Finalize button, link component API

* Add toggle field to custom form builder + Component

* Basic tabs component

* Custom tabs, convert all menu / tab instances in app

* Gem updates

* Centralized icon helper

* Update all icon usage to central helper

* Lint fixes

* Centralize all disclosure instances

* Dialog replacements

* Consolidation of all dialog styles

* Test fixes

* Fix app layout issues, move to component with slots

* Layout simplification

* Flakey test fix

* Fix dashboard mobile issues

* Finalize homepage

* Lint fixes

* Fix shadows and borders in dark mode

* Fix tests

* Remove stale class

* Fix filled icon logic

* Move transparent? to public interface

test/controllers/chats_controller_test.rb

@@ -7,12 +7,6 @@ class ChatsControllerTest < ActionDispatch::IntegrationTest
     sign_in @user
   end
 
-  test "cannot create a chat if AI is disabled" do
-    @user.update!(ai_enabled: false)
-    post chats_url, params: { chat: { content: "Hello", ai_model: "gpt-4o" } }
-    assert_response :forbidden
-  end
-
   test "gets index" do
     get chats_url
     assert_response :success