Adds Online Booking configuration and preview components

Introduces comprehensive online booking feature with:
- Localization support for booking settings
- ViewComponents for booking URL, settings, company info, hours, and preview
- Responsive preview with device toggle functionality
- Integrated with settings page and translation files

Enhances application's online booking configuration interface

PlanTempus.Application/Features/OnlineBooking/Components/OnlineBookingUrl/Default.cshtml

@@ -0,0 +1,31 @@
+<swp-card>
+    <swp-card-header>
+        <swp-card-title>
+            <i class="ph ph-link"></i>
+            <span localize="onlineBooking.url.title">Booking URL</span>
+        </swp-card-title>
+    </swp-card-header>
+    <swp-card-content>
+        <swp-url-field>
+            <input type="text" value="https://book.plantempus.dk/salonbeauty" readonly id="booking-url">
+            <swp-url-copy title="Kopier link" onclick="copyBookingUrl()">
+                <i class="ph ph-copy"></i>
+            </swp-url-copy>
+        </swp-url-field>
+        <swp-url-actions>
+            <swp-btn class="secondary sm" onclick="window.open(document.getElementById('booking-url').value, '_blank')">
+                <i class="ph ph-arrow-square-out"></i>
+                <span localize="onlineBooking.url.open">Åbn i ny fane</span>
+            </swp-btn>
+        </swp-url-actions>
+    </swp-card-content>
+</swp-card>
+
+<script>
+function copyBookingUrl() {
+    const input = document.getElementById('booking-url');
+    navigator.clipboard.writeText(input.value).then(() => {
+        // Could show a toast notification here
+    });
+}
+</script>