consolidate all external links through external_link component

Add icon={false} option to external_link for links with their own
visual indicator. Migrate remaining manual target="_blank" links:
email settings adapter links, product show provider edit, card radio
links, social link cards/icons, page renderer tracking and video
fallback. Every external link in the codebase now goes through the
single component — one place to change rel, target, or sr-only text.

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

lib/berrypod_web/components/core_components.ex

@@ -426,9 +426,12 @@ defmodule BerrypodWeb.CoreComponents do
   @doc """
   Renders a link to an external site with proper security attributes,
   an external-link icon, and screen reader context.
+
+  Set `icon={false}` when the link already contains its own visual indicator.
   """
   attr :href, :string, required: true
   attr :class, :string, default: nil
+  attr :icon, :boolean, default: true
   attr :rest, :global
   slot :inner_block, required: true
 
@@ -436,7 +439,7 @@ defmodule BerrypodWeb.CoreComponents do
     ~H"""
     <a href={@href} target="_blank" rel="noopener noreferrer" class={@class} {@rest}>
       {render_slot(@inner_block)}
-      <.icon name="hero-arrow-top-right-on-square" class="external-link-icon" />
+      <.icon :if={@icon} name="hero-arrow-top-right-on-square" class="external-link-icon" />
       <span class="sr-only">(opens in new tab)</span>
     </a>
     """
@@ -623,17 +626,16 @@ defmodule BerrypodWeb.CoreComponents do
       {@option.description}
     </span>
     <span :if={@option[:badge]} class="card-radio-badge">{@option.badge}</span>
-    <a
+    <.external_link
       :if={@option[:url]}
       href={@option.url}
-      target="_blank"
-      rel="noopener noreferrer"
+      icon={false}
       class="card-radio-link"
       onclick="event.stopPropagation();"
-      aria-label={@option.name <> " (opens in new tab)"}
+      aria-label={@option.name}
     >
       {@option.name} &nearr;
-    </a>
+    </.external_link>
     """
   end