feat: add language switcher component with flag icons for English and Thai locales.

Frontend-Learner/components/common/LanguageSwitcher.vue

@@ -15,10 +15,8 @@ const availableLocales = computed(() => {
   }))
 })
 
-// Get current locale display (TH or EN)
-const currentLocaleDisplay = computed(() => {
-  return locale.value.toUpperCase()
-})
+// Get flag image path for a locale
+const getFlagPath = (code: string) => `/flags/${code}.png`
 
 // Handle locale change
 const changeLocale = async (code: string) => {
@@ -34,14 +32,19 @@ const changeLocale = async (code: string) => {
     class="language-btn"
     :aria-label="$t('language.label')"
   >
-    <span class="language-text">{{ currentLocaleDisplay }}</span>
+    <!-- Show current locale flag -->
+    <img 
+      :src="getFlagPath(locale)" 
+      :alt="locale.toUpperCase()" 
+      class="flag-icon"
+    />
     
     <q-menu
       anchor="bottom right"
       self="top right"
       class="language-menu"
     >
-      <q-list style="min-width: 150px">
+      <q-list style="min-width: 180px">
         <q-item-label header class="text-xs font-bold uppercase tracking-wider" style="color: var(--text-secondary);">
           {{ $t('language.label') }}
         </q-item-label>
@@ -56,7 +59,11 @@ const changeLocale = async (code: string) => {
           class="language-item"
         >
           <q-item-section avatar>
-            <span class="text-lg">{{ loc.code === 'th' ? '🇹🇭' : '🇺🇸' }}</span>
+            <img 
+              :src="getFlagPath(loc.code)" 
+              :alt="loc.code.toUpperCase()" 
+              class="flag-icon-menu"
+            />
           </q-item-section>
           <q-item-section>
             <q-item-label class="font-semibold" style="color: var(--text-primary);">
@@ -81,21 +88,33 @@ const changeLocale = async (code: string) => {
 .language-btn {
   width: 40px;
   height: 40px;
-  background: linear-gradient(135deg, var(--primary) 0%, #2f5ed7 100%);
-  color: white;
+  background: #ffffff;
+  border: 2px solid var(--border-color);
   transition: all 0.3s ease;
-  box-shadow: 0 2px 8px rgba(75, 130, 247, 0.3);
+  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
+  overflow: hidden;
+  padding: 0;
 }
 
 .language-btn:hover {
   transform: scale(1.05);
-  box-shadow: 0 4px 12px rgba(75, 130, 247, 0.4);
+  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
+  border-color: var(--primary);
 }
 
-.language-text {
-  font-size: 12px;
-  font-weight: 800;
-  letter-spacing: 0.5px;
+.flag-icon {
+  width: 28px;
+  height: 28px;
+  object-fit: cover;
+  border-radius: 50%;
+}
+
+.flag-icon-menu {
+  width: 28px;
+  height: 20px;
+  object-fit: cover;
+  border-radius: 4px;
+  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
 }
 
 .language-item {
@@ -120,12 +139,14 @@ const changeLocale = async (code: string) => {
 }
 
 :global(.dark) .language-btn {
-  background: linear-gradient(135deg, #3b82f6 0%, #1e40af 100%);
-  box-shadow: 0 2px 8px rgba(59, 130, 246, 0.4);
+  background: #1e293b;
+  border-color: rgba(255, 255, 255, 0.15);
+  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
 }
 
 :global(.dark) .language-btn:hover {
-  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.5);
+  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
+  border-color: var(--primary);
 }
 
 :global(.dark) :deep(.language-menu) {