Add pulsing icon for residences with overdue tasks

- Add overdueCount field to ResidenceResponse model
- ResidenceCard shows PulsingIconView when residence has overdue tasks
- SummaryCard uses static CaseraIconView (never pulses)
- APILayer refreshes residence data after task completion to update
  overdue counts and animation state

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

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

composeApp/src/commonMain/kotlin/com/example/casera/models/Residence.kt

@@ -51,6 +51,7 @@ data class ResidenceResponse(
     @SerialName("purchase_price") val purchasePrice: Double? = null,
     @SerialName("is_primary") val isPrimary: Boolean = false,
     @SerialName("is_active") val isActive: Boolean = true,
+    @SerialName("overdue_count") val overdueCount: Int = 0,
     @SerialName("created_at") val createdAt: String,
     @SerialName("updated_at") val updatedAt: String
 ) {