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

.cursor/rules/project-conventions.mdc

@@ -53,6 +53,7 @@ This codebase adopts a "skinny controller, fat models" convention.  Furthermore,
 - Use Turbo streams to enhance functionality, but do not solely depend on it
 - Format currencies, numbers, dates, and other values server-side, then pass to Stimulus controllers for display only
 - Keep client-side code for where it truly shines.  For example, @bulk_select_controller.js is a case where server-side solutions would degrade the user experience significantly.  When bulk-selecting entries, client-side solutions are the way to go and Stimulus provides the right toolset to achieve this.
+- Always use the `icon` helper in [application_helper.rb](mdc:app/helpers/application_helper.rb) for icons.  NEVER use `lucide_icon` helper directly.
 
 The Hotwire suite (Turbo/Stimulus) works very well with these native elements and we optimize for this.