UI: Cyber/IT design overhaul with semantic status tokens (Material 3)

Re-theme TasQ with a refined enterprise "Cyber/IT" identity on Material 3.
Functionality is unchanged — only color/shape tokens and a few state widgets.

Foundation:
- Hand-tuned light + dark ColorSchemes (deep-slate surfaces, azure/teal/violet
  accents), tightened 12-16dp shape language, flat hairline-outlined cards.
- New AppStatusColors theme extension (success/warning/danger/info/neutral,
  per-brightness) replacing scattered raw Colors.green/orange/red/grey so status
  color is consistent and legible in dark mode.
- New TechChip mono primitive; StatusPill.kind; M3Card hairline variants;
  tightened AppSurfaces radii.

Per-screen:
- Tokenized status colors + radii across dashboard, tickets, tasks, IT service
  requests, attendance, whereabouts, network map, reports charts, auth, and
  shared/admin screens. Added _ticketStatusKind/_taskStatusKind/_isrStatusKind
  mappers so status carries meaning consistently.
- Fixed white pie-slice borders for dark mode; dropped ad-hoc dialog radius
  overrides in favor of the theme default. Categorical palettes (leave-type
  icons, team color picker, distribution charts) intentionally preserved.

Verified: flutter analyze lib clean; flutter build web green; visual QA in
light and dark (dashboard, tickets, attendance).

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

lib/screens/auth/signup_screen.dart

@@ -4,6 +4,7 @@ import 'package:go_router/go_router.dart';
 
 import '../../providers/auth_provider.dart';
 import '../../providers/tickets_provider.dart';
+import '../../theme/app_status_colors.dart';
 import '../../theme/m3_motion.dart';
 import '../../utils/snackbar.dart';
 
@@ -563,23 +564,24 @@ class _SignUpScreenState extends ConsumerState<SignUpScreen>
     }
 
     final normalized = (score / 6).clamp(0.0, 1.0);
+    final s = AppStatusColors.of(context);
     String label;
     Color color;
     if (normalized <= 0.2) {
       label = 'Very weak';
-      color = Colors.red;
+      color = s.danger.color;
     } else if (normalized <= 0.4) {
       label = 'Weak';
-      color = Colors.deepOrange;
+      color = s.danger.color;
     } else if (normalized <= 0.6) {
       label = 'Fair';
-      color = Colors.orange;
+      color = s.warning.color;
     } else if (normalized <= 0.8) {
       label = 'Strong';
-      color = Colors.green;
+      color = s.info.color;
     } else {
       label = 'Excellent';
-      color = Colors.teal;
+      color = s.success.color;
     }
 
     setState(() {