replace orphaned tailwind classes with project CSS

auth pages (login, registration, confirmation, recover) now use
setup-page/setup-header/admin-btn-block. theme toggle indicator
gets proper CSS. cleaned up dead h-full, size-3.5, ml-2 classes.

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

lib/berrypod_web/live/setup/recover.ex

@@ -69,13 +69,15 @@ defmodule BerrypodWeb.Setup.Recover do
   def render(assigns) do
     ~H"""
     <Layouts.app flash={@flash} current_scope={@current_scope}>
-      <div class="mx-auto max-w-sm flex flex-col gap-4">
-        <.header>
-          Account recovery
-          <:subtitle>
-            Reset your admin password using the setup secret from your server logs.
-          </:subtitle>
-        </.header>
+      <div class="setup-page">
+        <div class="setup-header">
+          <.header>
+            Account recovery
+            <:subtitle>
+              Reset your admin password using the setup secret from your server logs.
+            </:subtitle>
+          </.header>
+        </div>
 
         <div class="admin-alert admin-alert-info">
           <.icon name="hero-information-circle" class="size-6 shrink-0" />
@@ -100,14 +102,14 @@ defmodule BerrypodWeb.Setup.Recover do
             autocomplete="new-password"
             required
           />
-          <p class="text-xs text-base-content/60 -mt-2">Minimum 12 characters</p>
-          <.button variant="primary" class="w-full">
+          <p class="setup-hint">Minimum 12 characters</p>
+          <.button variant="primary" class="admin-btn-block">
             Reset password and log in
           </.button>
         </.form>
 
-        <p class="text-sm text-center text-base-content/60">
-          <.link navigate={~p"/users/log-in"} class="font-semibold text-brand hover:underline">
+        <p class="setup-footer">
+          <.link navigate={~p"/users/log-in"} class="admin-link">
             Back to login
           </.link>
         </p>