Stemify iOS 1.1 and WebUI updates, repo restructure into desktop/ios/server/web

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

ios/Widgets/StemifyWidgets.swift

@@ -0,0 +1,100 @@
+import SwiftUI
+import WidgetKit
+
+@main
+struct StemifyWidgets: WidgetBundle {
+    var body: some Widget {
+        MixerWidget()
+        MixWidget()
+        if #available(iOS 18.0, *) { MixControl() }
+    }
+}
+
+/// Audio intents run in the app's process, so the extension's copy never does anything.
+@MainActor
+enum MixRemote {
+    static func run(_ a: MixAction) {}
+}
+
+// ---- timeline -----------------------------------------------------------------------------
+
+struct MixerEntry: TimelineEntry {
+    var date = Date()
+    var snap: WidgetSnapshot
+    var art: UIImage?
+
+    /// The app reloads the widgets whenever the song or mix changes, so one entry is enough.
+    static func now() -> MixerEntry {
+        let s = WidgetStore.load()
+        let art = s.art == nil ? nil : WidgetStore.artURL.flatMap { UIImage(contentsOfFile: $0.path) }
+        return MixerEntry(snap: s, art: art)
+    }
+
+    static let sample = MixerEntry(snap: WidgetSnapshot(
+        title: "Midnight City", artist: "M83", mix: "Karaoke", next: "A Cappella", playing: true,
+        stems: [
+            WidgetStem(name: "vocals", label: "Vocals", color: 0xFF7AB6, level: 0.8, percent: 100, muted: true),
+            WidgetStem(name: "drums", label: "Drums", color: 0xFFB547, level: 0.8, percent: 100),
+            WidgetStem(name: "bass", label: "Bass", color: 0x7C8CFF, level: 0.9, percent: 127),
+            WidgetStem(name: "other", label: "Other", color: 0x4CD07D, level: 0.7, percent: 77),
+        ]))
+}
+
+struct MixerProvider: TimelineProvider {
+    func placeholder(in context: Context) -> MixerEntry { .sample }
+
+    func getSnapshot(in context: Context, completion: @escaping (MixerEntry) -> Void) {
+        let e = MixerEntry.now()
+        completion(context.isPreview && !e.snap.hasStems ? .sample : e)
+    }
+
+    func getTimeline(in context: Context, completion: @escaping (Timeline<MixerEntry>) -> Void) {
+        completion(Timeline(entries: [.now()], policy: .never))
+    }
+}
+
+// ---- widgets ------------------------------------------------------------------------------
+
+struct MixerWidget: Widget {
+    var body: some WidgetConfiguration {
+        StaticConfiguration(kind: WidgetStore.mixerKind, provider: MixerProvider()) { e in
+            MixerView(entry: e).containerBackground(for: .widget) { Look.bg }
+        }
+        .configurationDisplayName("Stem Mixer")
+        .description("A knob for each stem. Tap the arrows to turn it, tap the knob to mute it.")
+        .supportedFamilies([.systemMedium, .systemLarge])
+    }
+}
+
+struct MixWidget: Widget {
+    var body: some WidgetConfiguration {
+        StaticConfiguration(kind: WidgetStore.mixKind, provider: MixerProvider()) { e in
+            MixView(entry: e)
+        }
+        .configurationDisplayName("Mix")
+        .description("The mix that's playing, and a button for the next one.")
+        .supportedFamilies([.systemSmall, .accessoryRectangular, .accessoryCircular])
+    }
+}
+
+/// Swaps the Lock Screen's flashlight or camera for a Mix button. Also works in Control Center and on the Action button.
+@available(iOS 18.0, *)
+struct MixControl: ControlWidget {
+    var body: some ControlWidgetConfiguration {
+        StaticControlConfiguration(kind: WidgetStore.controlKind, provider: Provider()) { mix in
+            ControlWidgetButton(action: CycleMixIntent()) {
+                Label(mix, systemImage: "slider.vertical.3")
+            }
+        }
+        .displayName("Change Mix")
+        .description("Moves to the next stem mix while stems play.")
+    }
+
+    struct Provider: ControlValueProvider {
+        var previewValue: String { "Karaoke" }
+        func currentValue() async throws -> String {
+            let s = WidgetStore.load()
+            return s.hasStems ? s.mix : "Mix"
+        }
+    }
+}