chore(layout): move deploy stamp from navbar to footer

Free up navbar space and let every viewport see the timestamp (the
old `hidden md:inline` hid it on phones). Now shows relative + full
UTC inline.

lib/microwaveprop_web/components/layouts.ex

@@ -83,7 +83,6 @@ defmodule MicrowavepropWeb.Layouts do
         </nav>
       </div>
       <div class="flex-none flex items-center gap-3">
-        <.deploy_stamp />
         <.theme_toggle />
       </div>
     </header>
@@ -105,6 +104,9 @@ defmodule MicrowavepropWeb.Layouts do
         <div>
           <.link navigate="/privacy" class="link link-hover">Privacy</.link>
         </div>
+        <div>
+          <.deploy_stamp />
+        </div>
       </div>
     </footer>
 
@@ -151,11 +153,8 @@ defmodule MicrowavepropWeb.Layouts do
     assigns = assign(assigns, build_time: ts, iso: iso, ago: format_time_ago(ts))
 
     ~H"""
-    <span
-      class="hidden md:inline text-xs opacity-60"
-      title={"Last deployed #{@iso}"}
-    >
-      Deployed {@ago}
+    <span title={"Last deployed #{@iso}"}>
+      Deployed {@ago} · <span class="font-mono">{@iso}</span>
     </span>
     """
   end