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/pages/machines/index.vue

@@ -11,7 +11,7 @@
         </NuxtLink>
       </div>
 
-      <div class="card bg-base-100 shadow-lg mb-6">
+      <div class="card bg-base-100 shadow-sm mb-6">
         <div class="card-body">
           <div class="grid grid-cols-1 md:grid-cols-2 gap-4">
             <div class="form-control">
@@ -65,7 +65,7 @@
         <div
           v-for="machine in filteredMachines"
           :key="machine.id"
-          class="card bg-base-100 shadow-lg hover:shadow-xl transition-shadow cursor-pointer"
+          class="card bg-base-100 shadow-sm hover:shadow-xl transition-shadow cursor-pointer"
           @click="viewMachineDetails(machine)"
         >
           <div class="card-body">

app/pages/machines/new.vue

@@ -20,7 +20,7 @@
       </div>
 
       <form v-else class="space-y-6" @submit.prevent="c.finalizeMachineCreation">
-        <div class="card bg-base-100 shadow-lg">
+        <div class="card bg-base-100 shadow-sm">
           <div class="card-body space-y-6">
             <!-- Basic fields -->
             <div class="grid grid-cols-1 md:grid-cols-2 gap-4">