Add Android OAuth support and fix map camera crash

- Add appAuthRedirectScheme manifest placeholder for flutter_appauth on Android
- Fix Google Maps camera animation crash on Android ("No valid view found")
- Add safety checks and retry mechanism for camera initialization
- Make action buttons always visible regardless of delivery selection

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

android/app/build.gradle.kts

@@ -24,10 +24,13 @@ android {
         applicationId = "com.goutezplanb.planb_logistic"
         // You can update the following values to match your application needs.
         // For more information, see: https://flutter.dev/to/review-gradle-config.
-        minSdk = 23  // Required for Google Navigation Flutter
+        minSdk = flutter.minSdkVersion  // Required for Google Navigation Flutter
         targetSdk = flutter.targetSdkVersion
         versionCode = flutter.versionCode
         versionName = flutter.versionName
+
+        // OAuth redirect scheme for flutter_appauth
+        manifestPlaceholders["appAuthRedirectScheme"] = "com.goutezplanb.delivery"
     }
 
     packagingOptions {

lib/components/dark_mode_map.dart

@@ -312,7 +312,7 @@ class _DarkModeMapComponentState extends State<DarkModeMapComponent> {
 
     // Calculate dynamic padding for bottom button bar
     final topPadding = 0.0;
-    final bottomPadding = widget.selectedDelivery != null ? 110.0 : 0.0;
+    final bottomPadding = 110.0;
 
     return Stack(
       children: [
@@ -327,10 +327,34 @@ class _DarkModeMapComponentState extends State<DarkModeMapComponent> {
               _navigationController = controller;
               // Apply dark mode style with a small delay to ensure map is ready
               await Future.delayed(const Duration(milliseconds: 500));
+
+              // Safety check: ensure widget is still mounted before proceeding
+              if (!mounted) return;
+
               await _applyDarkModeStyle();
-              controller.animateCamera(
+
+              // Wrap camera animation in try-catch to handle "No valid view found" errors
+              // This can happen on Android when the view isn't fully ready
+              try {
+                if (mounted && _navigationController != null) {
+                  await controller.animateCamera(
                     CameraUpdate.newLatLngZoom(initialPosition, 12),
                   );
+                }
+              } catch (e) {
+                debugPrint('Camera animation error (view may not be ready): $e');
+                // Retry once after a longer delay
+                await Future.delayed(const Duration(milliseconds: 1000));
+                if (mounted && _navigationController != null) {
+                  try {
+                    await controller.animateCamera(
+                      CameraUpdate.newLatLngZoom(initialPosition, 12),
+                    );
+                  } catch (e2) {
+                    debugPrint('Camera animation retry failed: $e2');
+                  }
+                }
+              }
             },
             initialCameraPosition: CameraPosition(
               target: initialPosition,
@@ -338,8 +362,7 @@ class _DarkModeMapComponentState extends State<DarkModeMapComponent> {
             ),
           ),
         ),
-        // Bottom action button bar - 4 equal-width buttons
+        // Bottom action button bar - 4 equal-width buttons (always visible)
-        if (widget.selectedDelivery != null)
         Positioned(
             bottom: 0,
             left: 0,
@@ -366,7 +389,7 @@ class _DarkModeMapComponentState extends State<DarkModeMapComponent> {
                     child: _buildBottomActionButton(
                       label: _isNavigating ? 'Stop' : 'Start',
                       icon: _isNavigating ? Icons.stop : Icons.navigation,
-                      onPressed: _isStartingNavigation || _isInitializing
+                      onPressed: _isStartingNavigation || _isInitializing || (widget.selectedDelivery == null && !_isNavigating)
                           ? null
                           : (_isNavigating ? _stopNavigation : _startNavigation),
                       isDanger: _isNavigating,
@@ -394,12 +417,14 @@ class _DarkModeMapComponentState extends State<DarkModeMapComponent> {
                   // Completed button
                   Expanded(
                     child: _buildBottomActionButton(
-                      label: widget.selectedDelivery!.delivered ? 'Undo' : 'Completed',
+                      label: widget.selectedDelivery?.delivered == true ? 'Undo' : 'Completed',
-                      icon: widget.selectedDelivery!.delivered ? Icons.undo : Icons.check_circle,
+                      icon: widget.selectedDelivery?.delivered == true ? Icons.undo : Icons.check_circle,
-                      onPressed: () => widget.onAction?.call(
+                      onPressed: widget.selectedDelivery != null
+                          ? () => widget.onAction?.call(
                                 widget.selectedDelivery!.delivered ? 'uncomplete' : 'complete',
-                      ),
+                              )
-                      isPrimary: !widget.selectedDelivery!.delivered,
+                          : null,
+                      isPrimary: widget.selectedDelivery != null && !widget.selectedDelivery!.delivered,
                     ),
                   ),
                 ],