UI Phase 2 (L4): ISR status-pill consistency + shared status-kind mapper

The IT Service Requests list tile still used the legacy StatusPill (violet
"DRAFT"); make it semantic like the detail header. Extract the ISR status ->
StatusKind mapping into a shared helper so list and detail stay in sync.

- New isr_status_kind.dart (public isrStatusKind); removed the private duplicate
  from the detail screen.
- _RequestTile now uses StatusPill.kind(isrStatusKind(status), ...).

(The request cards were already content-dense; no layout change needed.)
Verified: flutter analyze lib clean; flutter build web green.

Co-Authored-By: claude-flow <ruv@ruv.net>

lib/screens/it_service_requests/isr_status_kind.dart

@@ -0,0 +1,16 @@
+import '../../models/it_service_request.model.dart';
+import '../../theme/app_status_colors.dart';
+
+/// Maps an IT service request status to a semantic [StatusKind] so its color
+/// carries meaning consistently across the list and detail screens
+/// (amber=pending approval, grey=scheduled, blue=in progress, green=completed,
+/// grey=cancelled).
+StatusKind isrStatusKind(String status) => switch (status) {
+  ItServiceRequestStatus.pendingApproval => StatusKind.warning,
+  ItServiceRequestStatus.scheduled => StatusKind.neutral,
+  ItServiceRequestStatus.inProgress => StatusKind.info,
+  ItServiceRequestStatus.inProgressDryRun => StatusKind.info,
+  ItServiceRequestStatus.completed => StatusKind.success,
+  ItServiceRequestStatus.cancelled => StatusKind.neutral,
+  _ => StatusKind.neutral,
+};