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/network_map/widgets/topology_legend.dart

@@ -2,6 +2,7 @@ import 'package:flutter/material.dart';
 
 import '../../../models/network/network_device.dart';
 import '../../../models/network/network_link.dart';
+import '../../../theme/app_surfaces.dart';
 
 /// Collapsible legend overlay explaining device role border colours and link
 /// type colours. Positioned at the bottom-left of the topology canvas view.
@@ -85,11 +86,15 @@ class _TopologyLegendState extends State<TopologyLegend>
         // Expand/collapse toggle chip
         Material(
           color: cs.surfaceContainerHigh,
-          borderRadius: BorderRadius.circular(20),
+          borderRadius: BorderRadius.circular(
+            AppSurfaces.of(context).containerRadius,
+          ),
           elevation: 2,
           child: InkWell(
             onTap: _toggle,
-            borderRadius: BorderRadius.circular(20),
+            borderRadius: BorderRadius.circular(
+              AppSurfaces.of(context).containerRadius,
+            ),
             child: Padding(
               padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 6),
               child: Row(