refactor(ui) : improve styling, layout and responsive across all components

Rework CSS theme (app.css), navbar layout, dashboard page, machine detail,
catalog pages, and various form/display components for better consistency
and mobile responsiveness.

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

app/app.vue

@@ -1,11 +1,16 @@
 <template>
-  <div class="min-h-screen bg-gradient-to-br from-blue-50 to-indigo-100">
+  <div class="min-h-screen flex flex-col bg-base-200/40">
+    <!-- Subtle dot pattern background -->
+    <div class="fixed inset-0 -z-10 bg-[radial-gradient(oklch(85%_0.02_260)_1px,transparent_1px)] bg-[size:24px_24px] opacity-40" />
+
     <AppNavbar
       @open-settings="displaySettingsOpen = true"
       @logout="handleLogout"
     />
 
-    <NuxtPage />
+    <main class="flex-1">
+      <NuxtPage :transition="{ name: 'page', mode: 'out-in' }" />
+    </main>
 
     <ToastContainer />
 
@@ -17,11 +22,17 @@
       @update-settings="handleSettingsUpdate"
     />
 
-    <footer class="footer p-4 bg-neutral text-neutral-content">
-      <div class="items-center grid-flow-col">
-        <p>
-          @Malio 2025 · <NuxtLink to="/changelog" class="link link-hover">v{{ appVersion }}</NuxtLink>
+    <footer class="border-t border-base-300/50 bg-base-100/60 backdrop-blur-sm">
+      <div class="container mx-auto flex items-center justify-between px-6 py-3">
+        <p class="text-xs text-base-content/40 font-medium tracking-wide">
+          &copy; Malio {{ new Date().getFullYear() }}
         </p>
+        <NuxtLink
+          to="/changelog"
+          class="text-xs text-base-content/40 hover:text-primary transition-colors font-medium"
+        >
+          v{{ appVersion }}
+        </NuxtLink>
       </div>
     </footer>
   </div>