add newsletter and email campaigns

Subscribers with double opt-in confirmation, campaign composer with
draft/scheduled/sent lifecycle, admin dashboard with overview stats,
CSV export, and shop signup form wired into page builder blocks.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

lib/berrypod_web/components/shop_components/content.ex

@@ -286,16 +286,18 @@ defmodule BerrypodWeb.ShopComponents.Content do
 
   ## Attributes
 
-  * `title` - Optional. Card heading. Defaults to "Stay in touch".
+  * `title` - Optional. Card heading. Defaults to "Newsletter".
   * `description` - Optional. Card description.
   * `button_text` - Optional. Button text. Defaults to "Subscribe".
   * `variant` - Optional. Either `:card` (default, with border/background) or `:inline` (no card styling, for embedding in footer).
+  * `newsletter_state` - Optional. `:idle | :submitted | :error | :disabled`. Defaults to `:idle`.
+  * `newsletter_enabled` - Optional. Whether signups are active. Defaults to `true`.
 
   ## Examples
 
       <.newsletter_card />
       <.newsletter_card title="Studio news" description="Get updates on new products." />
-      <.newsletter_card variant={:inline} />
+      <.newsletter_card variant={:inline} newsletter_state={@newsletter_state} />
   """
   attr :title, :string, default: "Newsletter"
 
@@ -304,6 +306,30 @@ defmodule BerrypodWeb.ShopComponents.Content do
 
   attr :button_text, :string, default: "Subscribe"
   attr :variant, :atom, default: :card
+  attr :newsletter_state, :atom, default: :idle
+  attr :newsletter_enabled, :boolean, default: true
+
+  def newsletter_card(%{newsletter_state: :submitted, variant: :inline} = assigns) do
+    ~H"""
+    <div>
+      <h3 class="newsletter-heading">{@title}</h3>
+      <p class="card-text card-text--spaced">
+        Check your inbox to confirm your subscription.
+      </p>
+    </div>
+    """
+  end
+
+  def newsletter_card(%{newsletter_state: :submitted} = assigns) do
+    ~H"""
+    <.shop_card class="card-section">
+      <h3 class="card-heading">{@title}</h3>
+      <p class="card-text card-text--spaced">
+        Check your inbox to confirm your subscription.
+      </p>
+    </.shop_card>
+    """
+  end
 
   def newsletter_card(%{variant: :inline} = assigns) do
     ~H"""
@@ -314,10 +340,27 @@ defmodule BerrypodWeb.ShopComponents.Content do
       <p class="card-text card-text--spaced">
         {@description}
       </p>
-      <form class="card-inline-form" onsubmit="return false">
-        <.shop_input type="email" placeholder="your@email.com" class="email-input" />
-        <.shop_button type="submit">{@button_text}</.shop_button>
-      </form>
+      <%= if @newsletter_enabled do %>
+        <form
+          action="/newsletter/subscribe"
+          method="post"
+          phx-submit="newsletter_subscribe"
+          class="card-inline-form"
+        >
+          <input type="hidden" name="_csrf_token" value={Phoenix.Controller.get_csrf_token()} />
+          <.shop_input
+            type="email"
+            name="email"
+            placeholder="your@email.com"
+            class="email-input"
+            required
+          />
+          <.shop_button type="submit">{@button_text}</.shop_button>
+        </form>
+        <p :if={@newsletter_state == :error} class="card-text newsletter-error">
+          Something went wrong. Please try again.
+        </p>
+      <% end %>
     </div>
     """
   end
@@ -329,10 +372,27 @@ defmodule BerrypodWeb.ShopComponents.Content do
       <p class="card-text card-text--spaced">
         {@description}
       </p>
-      <form class="card-inline-form" onsubmit="return false">
-        <.shop_input type="email" placeholder="your@email.com" class="email-input" />
-        <.shop_button type="submit">{@button_text}</.shop_button>
-      </form>
+      <%= if @newsletter_enabled do %>
+        <form
+          action="/newsletter/subscribe"
+          method="post"
+          phx-submit="newsletter_subscribe"
+          class="card-inline-form"
+        >
+          <input type="hidden" name="_csrf_token" value={Phoenix.Controller.get_csrf_token()} />
+          <.shop_input
+            type="email"
+            name="email"
+            placeholder="your@email.com"
+            class="email-input"
+            required
+          />
+          <.shop_button type="submit">{@button_text}</.shop_button>
+        </form>
+        <p :if={@newsletter_state == :error} class="card-text newsletter-error">
+          Something went wrong. Please try again.
+        </p>
+      <% end %>
     </.shop_card>
     """
   end