improve setup UX: password field, setup hook, checklist banners, theme tweaks

- add password field and required shop name to setup wizard
- extract SetupHook for DRY redirect to /setup when no admin exists
- add ?from=checklist param to checklist hrefs with contextual banner on
  email settings and theme pages for easy return to dashboard
- remove email warning banner from admin layout (checklist covers it)
- make email a required checklist item (no longer optional)
- add DevReset module for wiping dev data without restart
- rename "Theme Studio" to "Theme", drop subtitle
- lower theme editor side-by-side breakpoint from 64em to 48em
- clean up login/registration pages (remove dead registration_open code)
- fix settings.put_secret to invalidate cache after write

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

lib/berrypod_web/live/admin/dashboard.ex

@@ -154,10 +154,8 @@ defmodule BerrypodWeb.Admin.Dashboard do
   defp launch_checklist(assigns) do
     items = checklist_items(assigns.setup)
 
-    # Email is optional — exclude from progress count
-    required_items = Enum.reject(items, &(&1.key == :email_configured))
-    done_count = Enum.count(required_items, & &1.done)
-    total = length(required_items)
+    done_count = Enum.count(items, & &1.done)
+    total = length(items)
     progress_pct = round(done_count / total * 100)
 
     assigns =
@@ -248,33 +246,36 @@ defmodule BerrypodWeb.Admin.Dashboard do
       %{
         key: :provider_connected,
         label: "Connect a print provider",
-        href: "/admin/providers"
+        href: "/admin/providers?from=checklist"
       },
       %{
         key: :stripe_connected,
         label: "Connect Stripe",
-        href: "/admin/settings"
+        href: "/admin/settings?from=checklist"
       },
       # Post-setup items
       %{
         key: :products_synced,
         label: "Sync your products",
-        href: if(setup.provider_connected, do: "/admin/products", else: "/admin/providers"),
+        href:
+          if(setup.provider_connected,
+            do: "/admin/products?from=checklist",
+            else: "/admin/providers?from=checklist"
+          ),
         hint: "Import products from your print provider."
       },
-      %{
-        key: :theme_customised,
-        label: "Customise your theme",
-        href: "/admin/theme",
-        hint: "Upload your logo, pick your colours, and choose a font that matches your brand."
-      },
       %{
         key: :email_configured,
         label: "Set up email",
-        href: "/admin/settings",
-        optional: true,
+        href: "/admin/settings/email?from=checklist",
         hint: "Needed for order confirmations, abandoned cart emails, and the contact form."
       },
+      %{
+        key: :theme_customised,
+        label: "Customise your theme",
+        href: "/admin/theme?from=checklist",
+        hint: "Upload your logo, pick your colours, and choose a font that matches your brand."
+      },
       %{
         key: :has_orders,
         label: "Place a test order",

lib/berrypod_web/live/admin/email_settings.ex

@@ -27,9 +27,15 @@ defmodule BerrypodWeb.Admin.EmailSettings do
        Settings.get_setting("email_from_address") || socket.assigns.current_scope.user.email
      )
      |> assign(:sending_test, false)
+     |> assign(:from_checklist, false)
      |> assign(:form, to_form(%{}, as: :email))}
   end
 
+  @impl true
+  def handle_params(params, _uri, socket) do
+    {:noreply, assign(socket, :from_checklist, params["from"] == "checklist")}
+  end
+
   defp load_adapter_values(adapter_key) do
     case Adapters.get(adapter_key) do
       nil ->
@@ -201,6 +207,15 @@ defmodule BerrypodWeb.Admin.EmailSettings do
   def render(assigns) do
     ~H"""
     <div class="admin-content-medium">
+      <div :if={@from_checklist} class="admin-checklist-banner">
+        <.icon name="hero-clipboard-document-check" class="size-5 admin-checklist-banner-icon" />
+        <span class="admin-checklist-banner-text">
+          You're setting up email for your shop.
+        </span>
+        <.link navigate={~p"/admin"} class="admin-link admin-checklist-banner-link">
+          &larr; Back to checklist
+        </.link>
+      </div>
       <.header>
         Email settings
         <:subtitle>

lib/berrypod_web/live/admin/theme/index.ex

@@ -61,7 +61,12 @@ defmodule BerrypodWeb.Admin.Theme.Index do
         progress: &handle_progress/3
       )
 
-    {:ok, socket}
+    {:ok, assign(socket, :from_checklist, false)}
+  end
+
+  @impl true
+  def handle_params(params, _uri, socket) do
+    {:noreply, assign(socket, :from_checklist, params["from"] == "checklist")}
   end
 
   defp handle_progress(:logo_upload, entry, socket) do

lib/berrypod_web/live/admin/theme/index.html.heex

@@ -37,14 +37,21 @@
       <.link href={~p"/admin"} class="theme-back-link">
         <.icon name="hero-arrow-left-mini" class="size-4" /> Admin
       </.link>
+
+      <div :if={@from_checklist} class="admin-checklist-banner">
+        <.icon name="hero-clipboard-document-check" class="size-5 admin-checklist-banner-icon" />
+        <span class="admin-checklist-banner-text">
+          You're customising your theme.
+        </span>
+        <.link navigate={~p"/admin"} class="admin-link admin-checklist-banner-link">
+          &larr; Back to checklist
+        </.link>
+      </div>
       
 <!-- Header -->
       <div class="theme-header">
         <div class="admin-fill">
-          <h1 class="theme-title">Theme Studio</h1>
-          <p class="theme-subtitle">
-            One theme, infinite possibilities. Every combination is designed to work beautifully.
-          </p>
+          <h1 class="theme-title">Theme</h1>
         </div>
         <button
           type="button"