Enhance frontend styling and accessibility features

- Updated .dockerignore to exclude backup directory with root-only permissions from build context.
- Added new CSS variables for card radius and transition duration in app.css.
- Implemented consistent focus ring styles for interactive elements to improve accessibility.
- Refactored card components across various pages to utilize a unified card style, enhancing visual consistency.
- Improved button styles with touch manipulation support for better user interaction on mobile devices.

frontend-nuxt/pages/login.vue

@@ -1,6 +1,6 @@
 <template>
   <div class="min-h-screen flex flex-col items-center justify-center bg-gradient-to-br from-base-200 via-base-300 to-primary/10 p-4 overflow-hidden">
-    <div class="card w-full max-w-sm bg-base-100 shadow-2xl ring-1 ring-base-300 login-card">
+    <div class="card card-app w-full max-w-sm login-card">
       <div class="card-body">
         <h1 class="card-title justify-center text-2xl">HnH Map</h1>
         <p class="text-center text-base-content/70 text-sm">Log in to continue</p>
@@ -23,7 +23,7 @@
               id="user"
               v-model="user"
               type="text"
-              class="input"
+              class="input min-h-11 touch-manipulation"
               required
               autocomplete="username"
             />
@@ -35,7 +35,7 @@
             autocomplete="current-password"
           />
           <p v-if="error" class="text-error text-sm">{{ error }}</p>
-          <button type="submit" class="btn btn-primary transition-all duration-200 hover:scale-[1.02]" :disabled="loading">
+          <button type="submit" class="btn btn-primary min-h-11 touch-manipulation" :disabled="loading">
             <span v-if="loading" class="loading loading-spinner loading-sm" />
             <span v-else>Log in</span>
           </button>