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/components/filled_icon_component.rb

@@ -0,0 +1,97 @@
+class FilledIconComponent < ViewComponent::Base
+  attr_reader :icon, :text, :hex_color, :size, :rounded, :variant
+
+  VARIANTS = %i[default text surface container].freeze
+
+  SIZES = {
+    sm: {
+      container_size: "w-6 h-6",
+      container_radius: "rounded-md",
+      icon_size: "sm",
+      text_size: "text-xs"
+    },
+    md: {
+      container_size: "w-8 h-8",
+      container_radius: "rounded-lg",
+      icon_size: "md",
+      text_size: "text-xs"
+    },
+    lg: {
+      container_size: "w-9 h-9",
+      container_radius: "rounded-xl",
+      icon_size: "lg",
+      text_size: "text-sm"
+    }
+  }.freeze
+
+  def initialize(variant: :default, icon: nil, text: nil, hex_color: nil, size: "md", rounded: false)
+    @variant = variant.to_sym
+    @icon = icon
+    @text = text
+    @hex_color = hex_color
+    @size = size.to_sym
+    @rounded = rounded
+  end
+
+  def container_classes
+    class_names(
+      "flex justify-center items-center",
+      size_classes,
+      radius_classes,
+      transparent? ? "border" : solid_bg_class
+    )
+  end
+
+  def icon_size
+    SIZES[size][:icon_size]
+  end
+
+  def text_classes
+    class_names(
+      "text-center font-medium uppercase",
+      SIZES[size][:text_size]
+    )
+  end
+
+  def container_styles
+    <<~STYLE.strip
+      background-color: #{transparent_bg_color};
+      border-color: #{transparent_border_color};
+      color: #{custom_fg_color};
+    STYLE
+  end
+
+  def transparent?
+    variant.in?(%i[default text])
+  end
+
+  private
+    def solid_bg_class
+      case variant
+      when :surface
+        "bg-surface-inset"
+      when :container
+        "bg-container-inset"
+      end
+    end
+
+    def size_classes
+      SIZES[size][:container_size]
+    end
+
+    def radius_classes
+      rounded ? "rounded-full" : SIZES[size][:container_radius]
+    end
+
+    def custom_fg_color
+      hex_color || "var(--color-gray-500)"
+    end
+
+    def transparent_bg_color
+      "color-mix(in oklab, #{custom_fg_color} 10%, transparent)"
+    end
+
+    def transparent_border_color
+      "color-mix(in oklab, #{custom_fg_color} 10%, transparent)"
+    end
+end