feat: Introduce mobile simulator UI with new routes, screens, shared application chrome, and updated dependencies.

WebApp/src/lib/sim/screens/ActivityScreen.svelte

@@ -0,0 +1,27 @@
+<section id="screen-activity" class="flex flex-col gap-6 max-w-4xl mx-auto py-4">
+	<div class="flex items-center justify-between">
+		<h2 class="text-2xl font-bold text-white tracking-tight">Activity History</h2>
+		<button
+			id="clearActivityBtn"
+			class="btn btn-ghost text-gray-400 hover:bg-white/5 hover:text-white rounded-xl border border-transparent"
+		>
+			Clear Read
+		</button>
+	</div>
+
+	<div class="glass-card rounded-3xl border border-white/5 p-2 overflow-hidden">
+		<div id="activityFeedList" class="divide-y divide-white/5">
+			<div class="text-center py-16 opacity-50">
+				<svg xmlns="http://www.w3.org/2000/svg" class="h-12 w-12 mx-auto mb-4 text-gray-600" fill="none" viewBox="0 0 24 24" stroke="currentColor">
+					<path
+						stroke-linecap="round"
+						stroke-linejoin="round"
+						stroke-width="2"
+						d="M15 17h5l-1.405-1.405A2.032 2.032 0 0118 14.158V11a6.002 6.002 0 00-4-5.659V5a2 2 0 10-4 0v.341C7.67 6.165 6 8.388 6 11v3.159c0 .538-.214 1.055-.595 1.436L4 17h5m6 0v1a3 3 0 11-6 0v-1m6 0H9"
+					/>
+				</svg>
+				<p class="text-sm font-medium text-gray-400">All quiet. No notifications yet.</p>
+			</div>
+		</div>
+	</div>
+</section>