fix(ios): dark-appearance-first + readable dirty badge (gold-on-light contrast)

Amber-gold accent is designed for the desktop's warm-dark background; on light
mode gold text/badges wash out. Match the desktop (dark theme by default):
.preferredColorScheme(.dark) at the root. DirtyBadge becomes a soft filled
capsule (amber on amber-18%) instead of amber-on-quaternary, readable in any mode.

ios/App/WebTerm/Screens/ProjectDetailScreen.swift

@@ -259,11 +259,12 @@ struct ProjectDetailScreen: View {
 struct DirtyBadge: View {
     var body: some View {
         Text(ProjectsCopy.dirtyBadge)
-            .font(DS.Typography.caption)
+            .font(DS.Typography.caption.weight(.medium))
+            // 软填充胶囊：amber 字 + amber 淡底（非浅灰底），明暗两态都清晰。
             .foregroundStyle(DS.Palette.statusWaiting)
             .padding(.horizontal, DS.Space.sm8)
             .padding(.vertical, DS.Space.xs2)
-            .background(.quaternary, in: Capsule())
+            .background(DS.Palette.statusWaiting.opacity(0.18), in: Capsule())
     }
 }