Fix linting issues and code quality improvements

Resolve 62 linting issues identified by flutter analyze, reducing
total issues from 79 to 17. All critical warnings addressed.

Changes:
- Replace deprecated withOpacity() with withValues(alpha:) (25 instances)
- Remove unused imports from 9 files
- Remove unused variables and fields (6 instances)
- Fix Riverpod 3.0 state access violations in settings_page
- Remove unnecessary null-aware operators in navigation_page (6 instances)
- Fix unnecessary type casts in providers (4 instances)
- Remove unused methods: _getDarkMapStyle, _showPermissionDialog
- Simplify hover state management by removing unused _isHovered fields

Remaining 17 issues are info-level style suggestions and defensive
programming patterns that don't impact functionality.

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

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

lib/components/dark_mode_map.dart

@@ -26,7 +26,6 @@ class _DarkModeMapComponentState extends State<DarkModeMapComponent> {
   GoogleNavigationViewController? _navigationController;
   bool _isNavigating = false;
   LatLng? _destinationLocation;
-  LatLng? _driverLocation;
   bool _isSessionInitialized = false;
   bool _isInitializing = false;
   bool _isStartingNavigation = false;
@@ -173,126 +172,6 @@ class _DarkModeMapComponentState extends State<DarkModeMapComponent> {
     }
   }
 
-  String _getDarkMapStyle() {
-    // Google Maps style JSON for dark mode with warm accents
-    return '''[
-      {
-        "elementType": "geometry",
-        "stylers": [{"color": "#212121"}]
-      },
-      {
-        "elementType": "labels.icon",
-        "stylers": [{"visibility": "off"}]
-      },
-      {
-        "elementType": "labels.text.fill",
-        "stylers": [{"color": "#757575"}]
-      },
-      {
-        "elementType": "labels.text.stroke",
-        "stylers": [{"color": "#212121"}]
-      },
-      {
-        "featureType": "administrative",
-        "elementType": "geometry",
-        "stylers": [{"color": "#757575"}]
-      },
-      {
-        "featureType": "administrative.country",
-        "elementType": "labels.text.fill",
-        "stylers": [{"color": "#9e9e9e"}]
-      },
-      {
-        "featureType": "administrative.land_parcel",
-        "stylers": [{"visibility": "off"}]
-      },
-      {
-        "featureType": "administrative.locality",
-        "elementType": "labels.text.fill",
-        "stylers": [{"color": "#bdbdbd"}]
-      },
-      {
-        "featureType": "administrative.neighborhood",
-        "stylers": [{"visibility": "off"}]
-      },
-      {
-        "featureType": "administrative.province",
-        "elementType": "labels.text.fill",
-        "stylers": [{"color": "#9e9e9e"}]
-      },
-      {
-        "featureType": "landscape",
-        "elementType": "geometry",
-        "stylers": [{"color": "#000000"}]
-      },
-      {
-        "featureType": "poi",
-        "elementType": "geometry",
-        "stylers": [{"color": "#383838"}]
-      },
-      {
-        "featureType": "poi",
-        "elementType": "labels.text.fill",
-        "stylers": [{"color": "#9e9e9e"}]
-      },
-      {
-        "featureType": "poi.park",
-        "elementType": "geometry",
-        "stylers": [{"color": "#181818"}]
-      },
-      {
-        "featureType": "poi.park",
-        "elementType": "labels.text.fill",
-        "stylers": [{"color": "#616161"}]
-      },
-      {
-        "featureType": "road",
-        "elementType": "geometry.fill",
-        "stylers": [{"color": "#2c2c2c"}]
-      },
-      {
-        "featureType": "road",
-        "elementType": "labels.text.fill",
-        "stylers": [{"color": "#8a8a8a"}]
-      },
-      {
-        "featureType": "road.arterial",
-        "elementType": "geometry",
-        "stylers": [{"color": "#373737"}]
-      },
-      {
-        "featureType": "road.highway",
-        "elementType": "geometry",
-        "stylers": [{"color": "#3c3c3c"}]
-      },
-      {
-        "featureType": "road.highway.controlled_access",
-        "elementType": "geometry",
-        "stylers": [{"color": "#4e4e4e"}]
-      },
-      {
-        "featureType": "road.local",
-        "elementType": "labels.text.fill",
-        "stylers": [{"color": "#616161"}]
-      },
-      {
-        "featureType": "transit",
-        "elementType": "labels.text.fill",
-        "stylers": [{"color": "#757575"}]
-      },
-      {
-        "featureType": "water",
-        "elementType": "geometry",
-        "stylers": [{"color": "#0c1221"}]
-      },
-      {
-        "featureType": "water",
-        "elementType": "labels.text.fill",
-        "stylers": [{"color": "#3d3d3d"}]
-      }
-    ]''';
-  }
-
   Future<void> _startNavigation() async {
     if (_destinationLocation == null) return;
 
@@ -461,9 +340,6 @@ class _DarkModeMapComponentState extends State<DarkModeMapComponent> {
     // Driver's current location (defaults to Montreal if not available)
     final initialPosition = const LatLng(latitude: 45.5017, longitude: -73.5673);
 
-    // Store driver location for navigation centering
-    _driverLocation = initialPosition;
-
     // Calculate dynamic padding for top info panel and bottom button bar
     // Increased to accommodate navigation widget info and action buttons
     final topPadding = widget.selectedDelivery != null ? 110.0 : 0.0;
@@ -550,7 +426,7 @@ class _DarkModeMapComponentState extends State<DarkModeMapComponent> {
                 color: Theme.of(context).colorScheme.surface,
                 boxShadow: [
                   BoxShadow(
-                    color: Colors.black.withOpacity(0.2),
+                    color: Colors.black.withValues(alpha: 0.2),
                     blurRadius: 8,
                     offset: const Offset(0, 2),
                   ),
@@ -631,7 +507,7 @@ class _DarkModeMapComponentState extends State<DarkModeMapComponent> {
                 color: Theme.of(context).colorScheme.surface,
                 boxShadow: [
                   BoxShadow(
-                    color: Colors.black.withOpacity(0.2),
+                    color: Colors.black.withValues(alpha: 0.2),
                     blurRadius: 8,
                     offset: const Offset(0, -2),
                   ),
@@ -700,7 +576,7 @@ class _DarkModeMapComponentState extends State<DarkModeMapComponent> {
         if (_isStartingNavigation || _isInitializing)
           Positioned.fill(
             child: Container(
-              color: Colors.black.withOpacity(0.4),
+              color: Colors.black.withValues(alpha: 0.4),
               child: Center(
                 child: Container(
                   padding: const EdgeInsets.all(24),
@@ -709,7 +585,7 @@ class _DarkModeMapComponentState extends State<DarkModeMapComponent> {
                     borderRadius: BorderRadius.circular(12),
                     boxShadow: [
                       BoxShadow(
-                        color: Colors.black.withOpacity(0.3),
+                        color: Colors.black.withValues(alpha: 0.3),
                         blurRadius: 12,
                         offset: const Offset(0, 4),
                       ),
@@ -743,7 +619,7 @@ class _DarkModeMapComponentState extends State<DarkModeMapComponent> {
                       Text(
                         'Please wait...',
                         style: Theme.of(context).textTheme.bodySmall?.copyWith(
-                          color: Theme.of(context).colorScheme.onSurface.withOpacity(0.7),
+                          color: Theme.of(context).colorScheme.onSurface.withValues(alpha: 0.7),
                         ),
                         textAlign: TextAlign.center,
                       ),
@@ -766,7 +642,7 @@ class _DarkModeMapComponentState extends State<DarkModeMapComponent> {
         shape: BoxShape.circle,
         boxShadow: [
           BoxShadow(
-            color: Colors.black.withOpacity(0.3),
+            color: Colors.black.withValues(alpha: 0.3),
             blurRadius: 4,
             offset: const Offset(0, 2),
           ),
@@ -812,7 +688,7 @@ class _DarkModeMapComponentState extends State<DarkModeMapComponent> {
 
     // Reduce opacity when disabled
     if (onPressed == null) {
-      backgroundColor = backgroundColor.withOpacity(0.5);
+      backgroundColor = backgroundColor.withValues(alpha: 0.5);
     }
 
     return Material(
@@ -858,7 +734,7 @@ class _DarkModeMapComponentState extends State<DarkModeMapComponent> {
     required Color color,
   }) {
     final isDisabled = onPressed == null;
-    final buttonColor = isDisabled ? color.withOpacity(0.5) : color;
+    final buttonColor = isDisabled ? color.withValues(alpha: 0.5) : color;
 
     return Container(
       margin: const EdgeInsets.only(bottom: 8),
@@ -866,7 +742,7 @@ class _DarkModeMapComponentState extends State<DarkModeMapComponent> {
         borderRadius: BorderRadius.circular(8),
         boxShadow: [
           BoxShadow(
-            color: Colors.black.withOpacity(0.3),
+            color: Colors.black.withValues(alpha: 0.3),
             blurRadius: 4,
             offset: const Offset(0, 2),
           ),

lib/components/delivery_list_item.dart

@@ -115,15 +115,15 @@ class _DeliveryListItemState extends State<DeliveryListItem>
                 decoration: BoxDecoration(
                   borderRadius: BorderRadius.circular(10),
                   color: widget.delivery.delivered
-                      ? Colors.green.withOpacity(0.15)
+                      ? Colors.green.withValues(alpha: 0.15)
                       : (_isHovered || widget.isSelected
                           ? Theme.of(context).colorScheme.surfaceContainer
                           : Colors.transparent),
                   boxShadow: (_isHovered || widget.isSelected) && !widget.delivery.delivered
                       ? [
                           BoxShadow(
-                            color: Colors.black.withOpacity(
-                              isDark ? 0.3 : 0.08,
+                            color: Colors.black.withValues(
+                              alpha: isDark ? 0.3 : 0.08,
                             ),
                             blurRadius: 8,
                             offset: const Offset(0, 4),
@@ -256,14 +256,13 @@ class _DeliveryListItemState extends State<DeliveryListItem>
                       ],
                     ),
                     // Total amount (if present)
-                    if (widget.delivery.orders.isNotEmpty &&
-                        widget.delivery.orders.first.totalAmount != null)
+                    if (widget.delivery.orders.isNotEmpty)
                       Padding(
                         padding: const EdgeInsets.only(top: 8, left: 16),
                         child: Align(
                           alignment: Alignment.centerLeft,
                           child: Text(
-                            'Total: \$${widget.delivery.orders.first.totalAmount!.toStringAsFixed(2)}',
+                            'Total: \$${widget.delivery.orders.first.totalAmount.toStringAsFixed(2)}',
                             style: Theme.of(context)
                                 .textTheme
                                 .labelSmall

lib/components/glassmorphic_route_card.dart

@@ -28,7 +28,6 @@ class GlassmorphicRouteCard extends StatefulWidget {
 class _GlassmorphicRouteCardState extends State<GlassmorphicRouteCard>
     with SingleTickerProviderStateMixin {
   late AnimationController _hoverController;
-  bool _isHovered = false;
 
   @override
   void initState() {
@@ -72,9 +71,6 @@ class _GlassmorphicRouteCardState extends State<GlassmorphicRouteCard>
   }
 
   void _setHovered(bool hovered) {
-    setState(() {
-      _isHovered = hovered;
-    });
     if (hovered) {
       _hoverController.forward();
     } else {

lib/components/premium_route_card.dart

@@ -24,7 +24,6 @@ class _PremiumRouteCardState extends State<PremiumRouteCard>
   late AnimationController _controller;
   late Animation<double> _scaleAnimation;
   late Animation<double> _shadowAnimation;
-  bool _isHovered = false;
 
   @override
   void initState() {
@@ -50,12 +49,10 @@ class _PremiumRouteCardState extends State<PremiumRouteCard>
   }
 
   void _onHoverEnter() {
-    setState(() => _isHovered = true);
     _controller.forward();
   }
 
   void _onHoverExit() {
-    setState(() => _isHovered = false);
     _controller.reverse();
   }
 
@@ -81,7 +78,7 @@ class _PremiumRouteCardState extends State<PremiumRouteCard>
                   borderRadius: BorderRadius.circular(12),
                   boxShadow: [
                     BoxShadow(
-                      color: Colors.black.withOpacity(isDark ? 0.3 : 0.1),
+                      color: Colors.black.withValues(alpha: isDark ? 0.3 : 0.1),
                       blurRadius: _shadowAnimation.value,
                       offset: Offset(0, _shadowAnimation.value * 0.5),
                     ),