iOS widget enhancements

ios/TimetableWidgetExtension/TimetableWidgetExtension.swift

@@ -16,7 +16,7 @@ struct TimetableDayWidget: Widget {
 
     var body: some WidgetConfiguration {
         StaticConfiguration(kind: kind, provider: TimetableDayProvider()) { entry in
-            TimetableDayView(entry: entry).widgetContainerBackground()
+            TimetableDayView(entry: entry).widgetSurface(entry: entry)
         }
         .configurationDisplayName("Marianum · Heute")
         .description("Stundenplan und Vertretungen für den anstehenden Schultag.")
@@ -52,7 +52,7 @@ struct TimetableWeekWidget: Widget {
 
     var body: some WidgetConfiguration {
         StaticConfiguration(kind: kind, provider: TimetableWeekProvider()) { entry in
-            TimetableWeekView(entry: entry).widgetContainerBackground()
+            TimetableWeekView(entry: entry).widgetSurface(entry: entry)
         }
         .configurationDisplayName("Marianum · Woche")
         .description("Stundenplan und Vertretungen für die ganze Schulwoche.")
@@ -116,6 +116,8 @@ struct TimetableEntry: TimelineEntry {
 }
 
 extension View {
+    /// Applies the user's chosen light/dark override on top of the system
+    /// scheme so the widget honours the in-app theme setting.
     @ViewBuilder
     func widgetThemeOverride(_ mode: String) -> some View {
         switch mode {
@@ -125,14 +127,38 @@ extension View {
         }
     }
 
-    /// `.containerBackground(_:for:)` is iOS 17+. Older iOS uses the
-    /// implicit `.background(...)` model and renders fine without it.
+    /// Wraps the widget view in the Marianum palette + container background
+    /// so all subviews can read `\.widgetPalette` and so the widget renders
+    /// in our warm off-white / dark-clay instead of system grey.
     @ViewBuilder
-    func widgetContainerBackground() -> some View {
+    func widgetSurface(entry: TimetableEntry) -> some View {
+        WidgetSurface(entry: entry) { self }
+    }
+}
+
+private struct WidgetSurface<Content: View>: View {
+    let entry: TimetableEntry
+    @ViewBuilder let content: () -> Content
+    @Environment(\.colorScheme) private var colorScheme
+
+    var body: some View {
+        let palette = WidgetPalette.resolve(
+            themeMode: entry.themeMode,
+            colorScheme: colorScheme
+        )
+        return AnyView(
+            background(content: content(), palette: palette)
+                .environment(\.widgetPalette, palette)
+                .widgetThemeOverride(entry.themeMode)
+        )
+    }
+
+    @ViewBuilder
+    private func background<C: View>(content: C, palette: WidgetPalette) -> some View {
         if #available(iOS 17.0, *) {
-            self.containerBackground(.fill.tertiary, for: .widget)
+            content.containerBackground(palette.background, for: .widget)
         } else {
-            self
+            content.background(palette.background)
         }
     }
 }