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/helpers/custom_confirm.rb

@@ -0,0 +1,51 @@
+# The shape of data expected by `confirm_dialog_controller.js` to override the
+# default browser confirm API via Turbo.
+class CustomConfirm
+  class << self
+    def for_resource_deletion(resource_name, high_severity: false)
+      new(
+        destructive: true,
+        high_severity: high_severity,
+        title: "Delete #{resource_name}?",
+        body: "Are you sure you want to delete #{resource_name}? This is not reversible.",
+        btn_text: "Delete #{resource_name}"
+      )
+    end
+  end
+
+  def initialize(title: default_title, body: default_body, btn_text: default_btn_text, destructive: false, high_severity: false)
+    @title = title
+    @body = body
+    @btn_text = btn_text
+    @btn_variant = derive_btn_variant(destructive, high_severity)
+  end
+
+  def to_data_attribute
+    {
+      title: title,
+      body: body,
+      confirmText: btn_text,
+      variant: btn_variant
+    }
+  end
+
+  private
+    attr_reader :title, :body, :btn_text, :btn_variant
+
+    def derive_btn_variant(destructive, high_severity)
+      return "primary" unless destructive
+      high_severity ? "destructive" : "outline-destructive"
+    end
+
+    def default_title
+      "Are you sure?"
+    end
+
+    def default_body
+      "This is not reversible."
+    end
+
+    def default_btn_text
+      "Confirm"
+    end
+end