Watch app MVP: XcodeGen project, gateway client, pair, feed, thread, new thread, notifications

SwiftUI watch-only app in watch/, generated by XcodeGen. Codable models mirror
gateway/src/contract.ts, with lenient string enums so new phases or decisions
still decode. A DemoGateway serves fixtures from the docs/api.md examples for
previews and demo mode. Swift Testing covers decoding the documented JSON,
request encoding, notification action parsing and the small view helpers.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

watch/WristCode/Views/PairView.swift

@@ -0,0 +1,92 @@
+// Pairing: the gateway URL and the 6 digit code that `wristcode pair` prints on the gateway.
+// Shown whenever there is no device token, or the gateway answers 401.
+
+import SwiftUI
+
+struct PairView: View {
+    @Environment(AppModel.self) private var model
+    @State private var url = DeviceStore.lastGatewayURL
+    @State private var code = ""
+    @State private var sending = false
+    @State private var error: String?
+
+    private var digits: String { code.filter(\.isNumber) }
+
+    var body: some View {
+        ScrollView {
+            VStack(alignment: .leading, spacing: 8) {
+                Text("WristCode")
+                    .font(.system(size: 22, weight: .bold, design: .rounded))
+                    .foregroundStyle(Theme.you)
+                Text("Run wristcode pair on the gateway, then enter the code.")
+                    .font(.system(size: 13))
+                    .foregroundStyle(Theme.secondaryText)
+
+                field("Gateway") {
+                    TextField("Gateway URL", text: $url)
+                        .textContentType(.URL)
+                }
+                field("Code") {
+                    TextField("6 digits", text: $code)
+                        .textContentType(.oneTimeCode)
+                }
+
+                Button(sending ? "Pairing" : "Pair") { pair() }
+                    .buttonStyle(PillButtonStyle(fill: Theme.you))
+                    .disabled(sending || digits.count != 6)
+                    .opacity(digits.count == 6 ? 1 : 0.5)
+                    .padding(.top, 4)
+
+                if let error {
+                    Text(error)
+                        .font(.system(size: 12))
+                        .foregroundStyle(Theme.secondaryText)
+                }
+
+                Button("Try the demo") { model.startDemo() }
+                    .buttonStyle(.plain)
+                    .font(.system(size: 13, weight: .semibold))
+                    .foregroundStyle(Theme.work)
+                    .frame(maxWidth: .infinity)
+                    .padding(.top, 6)
+            }
+            .padding(.horizontal, 4)
+        }
+        .textInputAutocapitalization(.never)
+        .autocorrectionDisabled()
+    }
+
+    private func field(_ label: String, @ViewBuilder input: () -> some View) -> some View {
+        VStack(alignment: .leading, spacing: 2) {
+            Text(label)
+                .font(.system(size: 11, weight: .semibold))
+                .foregroundStyle(Theme.secondaryText)
+            input()
+        }
+    }
+
+    private func pair() {
+        guard let gatewayURL = DeviceStore.normalizeGatewayURL(url) else {
+            error = "That gateway URL doesn't look right."
+            return
+        }
+        sending = true
+        error = nil
+        Task {
+            do {
+                try await model.pair(gatewayURL: gatewayURL, code: digits)
+            } catch let failure as GatewayError where failure == .unauthorized {
+                error = "That code is wrong or expired."
+            } catch {
+                self.error = error.localizedDescription
+            }
+            sending = false
+        }
+    }
+}
+
+#Preview("Pair") {
+    PairView()
+        .environment(AppModel(mode: .unpaired))
+        .fontDesign(.rounded)
+}