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

app/views/budgets/_budget_nav.html.erb

@@ -24,7 +24,7 @@
       <%= link_to step[:path], class: "flex items-center gap-3" do %>
         <div class="flex items-center gap-2 text-sm font-medium <%= text_class %>">
           <span class="<%= step_class %> w-7 h-7 rounded-full shrink-0 inline-flex items-center justify-center border border-transparent">
-            <%= step[:is_complete] && !is_current ? lucide_icon("check", class: "w-4 h-4") : idx + 1 %>
+            <%= step[:is_complete] && !is_current ? icon("check", size: "sm") : idx + 1 %>
           </span>
 
           <span><%= step[:name] %></span>