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/reports/widgets/request_distribution_charts.dart

@@ -109,7 +109,7 @@ class _RequestTypeChartState extends ConsumerState<RequestTypeChart> {
                     radius: isTouched ? 60 : 50,
                     color: colorFor(i, e.name),
                     borderSide: isTouched
-                        ? const BorderSide(color: Colors.white, width: 2)
+                        ? BorderSide(color: Theme.of(context).colorScheme.surface, width: 2)
                         : BorderSide.none,
                   );
                 }).toList(),
@@ -240,7 +240,7 @@ class _RequestCategoryChartState extends ConsumerState<RequestCategoryChart> {
                     radius: isTouched ? 60 : 50,
                     color: colorFor(i, e.name),
                     borderSide: isTouched
-                        ? const BorderSide(color: Colors.white, width: 2)
+                        ? BorderSide(color: Theme.of(context).colorScheme.surface, width: 2)
                         : BorderSide.none,
                   );
                 }).toList(),