feat: add PlatformWidget extension target

ios/Platform/PlatformWidget/PlatformWidget.swift

@@ -0,0 +1,62 @@
+import WidgetKit
+import SwiftUI
+
+struct Provider: TimelineProvider {
+    func placeholder(in context: Context) -> SimpleEntry {
+        SimpleEntry(date: Date())
+    }
+
+    func getSnapshot(in context: Context, completion: @escaping (SimpleEntry) -> Void) {
+        let entry = SimpleEntry(date: Date())
+        completion(entry)
+    }
+
+    func getTimeline(in context: Context, completion: @escaping (Timeline<SimpleEntry>) -> Void) {
+        var entries: [SimpleEntry] = []
+        let currentDate = Date()
+        for hourOffset in 0 ..< 5 {
+            let entryDate = Calendar.current.date(byAdding: .hour, value: hourOffset, to: currentDate)!
+            let entry = SimpleEntry(date: entryDate)
+            entries.append(entry)
+        }
+        let timeline = Timeline(entries: entries, policy: .atEnd)
+        completion(timeline)
+    }
+}
+
+struct SimpleEntry: TimelineEntry {
+    let date: Date
+}
+
+struct PlatformWidgetEntryView: View {
+    var entry: Provider.Entry
+
+    var body: some View {
+        VStack {
+            Text("Platform")
+                .font(.headline)
+            Text(entry.date, style: .time)
+                .font(.caption)
+        }
+    }
+}
+
+struct PlatformWidget: Widget {
+    let kind: String = "PlatformWidget"
+
+    var body: some WidgetConfiguration {
+        StaticConfiguration(kind: kind, provider: Provider()) { entry in
+            PlatformWidgetEntryView(entry: entry)
+                .containerBackground(.fill.tertiary, for: .widget)
+        }
+        .configurationDisplayName("Platform")
+        .description("Platform widget.")
+        .supportedFamilies([.systemSmall, .systemMedium])
+    }
+}
+
+#Preview(as: .systemSmall) {
+    PlatformWidget()
+} timeline: {
+    SimpleEntry(date: .now)
+}