Add DaisyUI-inspired Button component

Create a comprehensive button component based on DaisyUI design system:

- Styles: primary, secondary, neutral, accent, ghost, default
- Sizes: xs (24px), sm (32px), md (48px), lg (64px)
- Shapes: square (rounded-lg) and circle (pill)
- Support for left/right icon slots
- Disabled state with proper styling
- Icon-only button variant (icon_button)

Import component globally in claper_web.ex for use in all views/LiveViews.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

lib/claper_web.ex

@@ -109,6 +109,9 @@ defmodule ClaperWeb do
       import ClaperWeb.ErrorHelpers
       use Gettext, backend: ClaperWeb.Gettext
 
+      # Import design system components
+      import ClaperWeb.Component.Button
+
       unquote(verified_routes())
     end
   end

lib/claper_web/views/components/button_component.ex

@@ -0,0 +1,165 @@
+defmodule ClaperWeb.Component.Button do
+  @moduledoc """
+  DaisyUI-inspired Button component for Claper.
+
+  ## Styles
+  - `:primary` - Purple background, white text (default)
+  - `:secondary` - Light background with purple text and border
+  - `:neutral` - Dark background, white text
+  - `:accent` - Teal/cyan accent color
+  - `:ghost` - Transparent background, visible on hover
+  - `:default` - Gray background, dark text
+
+  ## Sizes
+  - `:xs` - Extra small (24px height)
+  - `:sm` - Small (32px height)
+  - `:md` - Medium (48px height, default)
+  - `:lg` - Large (64px height)
+
+  ## Shapes
+  - `:square` - Standard rounded corners (default)
+  - `:circle` - Fully rounded (pill shape)
+
+  ## Examples
+
+      <.button>Click me</.button>
+      <.button style={:primary} size={:lg}>Large Primary</.button>
+      <.button style={:ghost} shape={:circle}>Ghost Pill</.button>
+      <.button disabled>Disabled</.button>
+  """
+  use ClaperWeb, :view_component
+
+  attr :type, :string, default: "button"
+  attr :style, :atom, default: :primary, values: [:primary, :secondary, :neutral, :accent, :ghost, :default]
+  attr :size, :atom, default: :md, values: [:xs, :sm, :md, :lg]
+  attr :shape, :atom, default: :square, values: [:square, :circle]
+  attr :disabled, :boolean, default: false
+  attr :class, :string, default: nil
+  attr :rest, :global, include: ~w(phx-click phx-target phx-disable-with phx-value-id form name value)
+
+  slot :inner_block, required: true
+  slot :icon_left
+  slot :icon_right
+
+  def button(assigns) do
+    ~H"""
+    <button
+      type={@type}
+      disabled={@disabled}
+      class={[
+        base_classes(),
+        size_classes(@size),
+        style_classes(@style),
+        shape_classes(@shape, @size),
+        disabled_classes(@disabled),
+        @class
+      ]}
+      {@rest}
+    >
+      <%= if @icon_left != [] do %>
+        <span class={icon_size_classes(@size)}>
+          {render_slot(@icon_left)}
+        </span>
+      <% end %>
+      <span class="truncate">{render_slot(@inner_block)}</span>
+      <%= if @icon_right != [] do %>
+        <span class={icon_size_classes(@size)}>
+          {render_slot(@icon_right)}
+        </span>
+      <% end %>
+    </button>
+    """
+  end
+
+  attr :type, :string, default: "button"
+  attr :style, :atom, default: :default, values: [:primary, :secondary, :neutral, :accent, :ghost, :default]
+  attr :size, :atom, default: :md, values: [:xs, :sm, :md, :lg]
+  attr :shape, :atom, default: :square, values: [:square, :circle]
+  attr :disabled, :boolean, default: false
+  attr :class, :string, default: nil
+  attr :rest, :global, include: ~w(phx-click phx-target phx-disable-with phx-value-id form name value)
+
+  slot :inner_block, required: true
+
+  def icon_button(assigns) do
+    ~H"""
+    <button
+      type={@type}
+      disabled={@disabled}
+      class={[
+        base_classes(),
+        icon_button_size_classes(@size),
+        style_classes(@style),
+        icon_button_shape_classes(@shape),
+        disabled_classes(@disabled),
+        @class
+      ]}
+      {@rest}
+    >
+      <span class={icon_size_classes(@size)}>
+        {render_slot(@inner_block)}
+      </span>
+    </button>
+    """
+  end
+
+  # Base classes for all buttons
+  defp base_classes do
+    "inline-flex items-center justify-center gap-2 font-bold font-display transition-all duration-200 ease-in-out focus:outline-none focus:ring-2 focus:ring-offset-2 whitespace-nowrap"
+  end
+
+  # Size classes
+  defp size_classes(:xs), do: "h-6 px-2.5 text-xs"
+  defp size_classes(:sm), do: "h-8 px-3.5 text-sm"
+  defp size_classes(:md), do: "h-12 px-4 text-base"
+  defp size_classes(:lg), do: "h-16 px-6 text-base"
+
+  # Icon button size classes (square dimensions)
+  defp icon_button_size_classes(:xs), do: "size-6"
+  defp icon_button_size_classes(:sm), do: "size-8"
+  defp icon_button_size_classes(:md), do: "size-12"
+  defp icon_button_size_classes(:lg), do: "size-16"
+
+  # Icon size classes
+  defp icon_size_classes(:xs), do: "size-4 shrink-0"
+  defp icon_size_classes(:sm), do: "size-[18px] shrink-0"
+  defp icon_size_classes(:md), do: "size-5 shrink-0"
+  defp icon_size_classes(:lg), do: "size-6 shrink-0"
+
+  # Style classes
+  defp style_classes(:primary) do
+    "bg-primary-500 text-white hover:bg-primary-600 active:bg-primary-700 focus:ring-primary-500"
+  end
+
+  defp style_classes(:secondary) do
+    "bg-primary-50 text-secondary-500 border border-primary-200 hover:bg-primary-100 active:bg-primary-200 focus:ring-primary-500"
+  end
+
+  defp style_classes(:neutral) do
+    "bg-neutral-800 text-white hover:bg-neutral-900 active:bg-neutral-700 focus:ring-neutral-500"
+  end
+
+  defp style_classes(:accent) do
+    "bg-supporting-green-500 text-white hover:bg-supporting-green-600 active:bg-supporting-green-700 focus:ring-supporting-green-500"
+  end
+
+  defp style_classes(:ghost) do
+    "bg-transparent text-gray-700 hover:bg-gray-100 active:bg-gray-200 focus:ring-gray-500"
+  end
+
+  defp style_classes(:default) do
+    "bg-gray-200 text-gray-800 hover:bg-gray-300 active:bg-gray-400 focus:ring-gray-500"
+  end
+
+  # Shape classes
+  defp shape_classes(:square, _size), do: "rounded-lg"
+  defp shape_classes(:circle, _size), do: "rounded-full"
+
+  # Icon button shape classes
+  defp icon_button_shape_classes(:square), do: "rounded-lg"
+  defp icon_button_shape_classes(:circle), do: "rounded-full"
+
+  # Disabled classes
+  defp disabled_classes(true), do: "opacity-50 cursor-not-allowed pointer-events-none"
+  defp disabled_classes(false), do: "cursor-pointer"
+end