Fix CaseraIconView to use theme color instead of hardcoded orange

- Add backgroundColor parameter to CaseraIconView and PulsingIconView
- Update ResidenceCard to pass Color.appPrimary for themed icon background
- Icon now matches the app's current theme like PropertyHeaderCard

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

iosApp/iosApp/Subviews/Residence/ResidenceCard.swift

@@ -15,11 +15,11 @@ struct ResidenceCard: View {
             HStack(spacing: AppSpacing.sm) {
                 VStack {
                     if hasOverdueTasks {
-                        PulsingIconView()
+                        PulsingIconView(backgroundColor: Color.appPrimary)
                             .frame(width: 44, height: 44)
                             .padding([.trailing], AppSpacing.md)
                     } else {
-                        CaseraIconView()
+                        CaseraIconView(backgroundColor: Color.appPrimary)
                             .frame(width: 44, height: 44)
                             .padding([.trailing], AppSpacing.md)
                     }