feat: add live draw feature and clean up docs

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/mobile/targets/widget/LiveDrawWidget.swift

@@ -0,0 +1,83 @@
+import WidgetKit
+import SwiftUI
+
+struct LiveDrawEntry: TimelineEntry {
+    let date: Date
+    let image: UIImage?
+}
+
+struct LiveDrawProvider: TimelineProvider {
+    let suiteName = "group.com.sauci.app"
+    let dataKey = "LiveDrawImage"
+
+    func placeholder(in context: Context) -> LiveDrawEntry {
+        LiveDrawEntry(date: Date(), image: nil)
+    }
+
+    func getSnapshot(in context: Context, completion: @escaping (LiveDrawEntry) -> Void) {
+        completion(getEntry())
+    }
+
+    func getTimeline(in context: Context, completion: @escaping (Timeline<LiveDrawEntry>) -> Void) {
+        let entry = getEntry()
+        let nextUpdate = Calendar.current.date(byAdding: .minute, value: 30, to: Date())!
+        let timeline = Timeline(entries: [entry], policy: .after(nextUpdate))
+        completion(timeline)
+    }
+
+    private func getEntry() -> LiveDrawEntry {
+        guard let suite = UserDefaults(suiteName: suiteName),
+              let base64 = suite.string(forKey: dataKey),
+              let imageData = Data(base64Encoded: base64),
+              let image = UIImage(data: imageData)
+        else {
+            return LiveDrawEntry(date: Date(), image: nil)
+        }
+        return LiveDrawEntry(date: Date(), image: image)
+    }
+}
+
+struct LiveDrawWidgetEntryView: View {
+    var entry: LiveDrawProvider.Entry
+
+    var body: some View {
+        if let image = entry.image {
+            Image(uiImage: image)
+                .resizable()
+                .aspectRatio(contentMode: .fill)
+                .clipShape(RoundedRectangle(cornerRadius: 16))
+        } else {
+            ZStack {
+                Color(red: 26/255, green: 26/255, blue: 46/255)
+                VStack(spacing: 8) {
+                    Image(systemName: "pencil.tip.crop.circle")
+                        .font(.system(size: 32))
+                        .foregroundColor(.white.opacity(0.5))
+                    Text("Draw together")
+                        .font(.caption)
+                        .foregroundColor(.white.opacity(0.5))
+                }
+            }
+        }
+    }
+}
+
+struct LiveDrawWidget: Widget {
+    let kind: String = "LiveDrawWidget"
+
+    var body: some WidgetConfiguration {
+        StaticConfiguration(kind: kind, provider: LiveDrawProvider()) { entry in
+            if #available(iOS 17.0, *) {
+                LiveDrawWidgetEntryView(entry: entry)
+                    .widgetURL(URL(string: "app.sauci://live-draw"))
+                    .containerBackground(Color(red: 26/255, green: 26/255, blue: 46/255), for: .widget)
+            } else {
+                LiveDrawWidgetEntryView(entry: entry)
+                    .widgetURL(URL(string: "app.sauci://live-draw"))
+            }
+        }
+        .configurationDisplayName("Live Draw")
+        .description("See your shared drawing with your partner.")
+        .supportedFamilies([.systemSmall, .systemMedium])
+    }
+}