fix(widget): resolve invisible content bug by applying proper containerBackground and dynamic contrast for transparent/tinted themes

On a tinted/transparent (or iOS 18 accented) home screen, the Action Run
widget turned into a solid white block with invisible content, while the
other widgets rendered fine. Cause: only the Action Run cell paints an opaque
tag-color background (WidgetTintedCellBackground) with hardcoded
.foregroundStyle(.white) text on top. In any non-.fullColor rendering mode
the system re-interprets that opaque fill toward white and the white text
disappears — classic white-on-white. The other widgets already use the
adaptive AppTheme.surface plus semantic .primary/.secondary text, which is
why they were unaffected.

Fix, confined to ActionRunCellView:
- Read @Environment(\.widgetRenderingMode). In .fullColor keep the tag-color
  fill + white text (unchanged). In accented/vibrant, drop the opaque fill to
  a faint translucent tint and render content with the semantic .primary color
  so the system's tint keeps a clear foreground/background contrast.
- No hardcoded .white survives on the tinted path; the container background is
  still owned by widgetAppTheme()'s .containerBackground(for: .widget) (clear
  in non-fullColor so the system glass shows through), so this composes safely
  with iOS 18 home-screen customization.

The Live Activity's white-on-tint icon (HaruDanimWidgets) is intentionally
left as-is — Live Activities always render full color and aren't subject to
home-screen widgetRenderingMode.

Verified in the in-app widget preview with a new DEBUG affordance
(-widgetRenderMode accented|vibrant, added to WidgetPreviewScreen): forcing
accented mode, the Action Run cells now show legible dark icons/labels/values
on a faint tint instead of blank white. Build succeeds.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013yKDMhuF39GVYy3FMcGHh7

myApp/HaruDanim/IOS/Views/WidgetPreviewScreen.swift

@@ -168,6 +168,16 @@ struct WidgetPreviewScreen: View {
         }
     }
 
+    /// -widgetRenderMode accented|vibrant → 색조/투명 홈 화면 렌더링 모드를 강제해
+    /// white-on-white 대비 문제를 앱 안에서 검증 (기본은 실제와 동일한 fullColor)
+    private var forcedRenderingMode: WidgetRenderingMode {
+        switch UserDefaults.standard.string(forKey: "widgetRenderMode") {
+        case "accented": return .accented
+        case "vibrant": return .vibrant
+        default: return .fullColor
+        }
+    }
+
     private func widgetBox(_ family: WidgetFamily, @ViewBuilder content: () -> some View) -> some View {
         let size: CGSize = switch family {
         case .systemMedium: CGSize(width: 338, height: 158)
@@ -181,6 +191,7 @@ struct WidgetPreviewScreen: View {
             .frame(width: size.width, height: size.height)
             .background(AppTheme.background)
             .environment(\.colorScheme, WidgetAppearance.appScheme)
+            .environment(\.widgetRenderingMode, forcedRenderingMode)
             .clipShape(RoundedRectangle(cornerRadius: 22, style: .continuous))
             .shadow(color: .black.opacity(0.08), radius: 6, y: 2)
     }

myApp/HaruDanim/Widgets/ActionRunWidget.swift

@@ -76,12 +76,17 @@ struct ActionRunProvider: AppIntentTimelineProvider {
 // MARK: - 뷰
 
 struct ActionRunCellView: View {
+    /// 홈 화면 렌더링 모드. .fullColor가 아니면(색조/투명/리퀴드 글라스, iOS 18 accented·vibrant)
+    /// 시스템이 색을 재해석하므로 흰색 하드코딩이 배경째 흰색으로 묻히는 white-on-white가 난다.
+    @Environment(\.widgetRenderingMode) private var renderingMode
     let cell: ActionCellSnapshot
     let periodLabel: String
     var compact = false
     /// 셀 하나가 위젯 전체를 차지할 때 (소형) — 위젯 모서리에 맞춰 여백 없이 채움
     var fullBleed = false
 
+    private var isFullColor: Bool { renderingMode == .fullColor }
+
     var body: some View {
         Button(intent: RunActionIntent(actionID: cell.id.uuidString)) {
             VStack(alignment: .leading, spacing: compact ? 2 : 4) {
@@ -113,10 +118,11 @@ struct ActionRunCellView: View {
                 .opacity(0.85)
                 .lineLimit(1)
             }
-            .foregroundStyle(.white)
+            // 풀컬러: 꼬리표 색 배경 위 흰 글씨. 색조/투명 모드: 시맨틱 컬러로 그려 시스템 틴트가 대비를 유지.
+            .foregroundStyle(isFullColor ? AnyShapeStyle(.white) : AnyShapeStyle(.primary))
             .padding(fullBleed ? 14 : (compact ? 8 : 12))
             .frame(maxWidth: .infinity, maxHeight: .infinity, alignment: .leading)
-            .background(WidgetTintedCellBackground(color: cell.color, fullBleed: fullBleed))
+            .background(cellBackground)
             .overlay {
                 if cell.isRunning {
                     if fullBleed {
@@ -131,6 +137,15 @@ struct ActionRunCellView: View {
         }
         .buttonStyle(.plain)
     }
+
+    /// 셀 배경: 풀컬러에선 꼬리표 색을 그대로, 색조/투명 모드에선 옅은 반투명으로 깔아
+    /// (불투명 색은 흰색 계열로 재해석돼 콘텐츠를 덮음) 시맨틱 콘텐츠가 위에서 대비를 이루게 한다.
+    @ViewBuilder private var cellBackground: some View {
+        WidgetTintedCellBackground(
+            color: isFullColor ? cell.color : cell.color.opacity(0.2),
+            fullBleed: fullBleed
+        )
+    }
 }
 
 struct ActionRunWidgetView: View {