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/components/previews/button_component_preview.rb

@@ -0,0 +1,16 @@
+class ButtonComponentPreview < ViewComponent::Preview
+  # @param variant select {{ ButtonComponent::VARIANTS.keys }}
+  # @param size select {{ ButtonComponent::SIZES.keys }}
+  # @param disabled toggle
+  # @param icon select ["plus", "circle"]
+  def default(variant: "primary", size: "md", disabled: false, icon: "plus")
+    render ButtonComponent.new(
+      text: "Sample button",
+      variant: variant,
+      size: size,
+      disabled: disabled,
+      icon: icon,
+      data: { menu_target: "button" }
+    )
+  end
+end