Unify task stats calculation and update UI labels

- Create shared TaskStatsCalculator for consistent date bucket logic
- Fix widget stats to use exclusive buckets (overdue | 7 days | 30 days)
- Update labels: "This Week" → "Next 7 Days" / "7 Days"
- Large widget now shows Overdue, 7 Days, 30 Days (removed Total)
- Rename "Pros" tab to "Contractors"
- Remove red pulsing ring from residence card icons

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

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

iosApp/iosApp/MainTabView.swift

@@ -34,7 +34,7 @@ struct MainTabView: View {
             }
             .id(refreshID)
             .tabItem {
-                Label("Pros", systemImage: "wrench.and.screwdriver.fill")
+                Label("Contractors", systemImage: "wrench.and.screwdriver.fill")
             }
             .tag(2)
             .accessibilityIdentifier(AccessibilityIdentifiers.Navigation.contractorsTab)