standardize all backbtns to use AppHeader widget

lib/ui/common/controls/app_header.dart

@@ -1,4 +1,5 @@
 import 'package:wonders/common_libs.dart';
+import 'package:wonders/ui/common/app_icons.dart';
 
 class AppHeader extends StatelessWidget {
   const AppHeader(
@@ -8,11 +9,15 @@ class AppHeader extends StatelessWidget {
       this.showBackBtn = true,
       this.isTransparent = false,
       this.onBack,
-      this.trailing})
+      this.trailing,
+      this.backIcon = AppIcons.prev,
+      this.backBtnSemantics})
       : super(key: key);
   final String? title;
   final String? subtitle;
   final bool showBackBtn;
+  final AppIcons backIcon;
+  final String? backBtnSemantics;
   final bool isTransparent;
   final VoidCallback? onBack;
   final Widget Function(BuildContext context)? trailing;
@@ -31,7 +36,12 @@ class AppHeader extends StatelessWidget {
                 child: Center(
                   child: Row(children: [
                     Gap($styles.insets.sm),
-                    if (showBackBtn) BackBtn(onPressed: onBack),
+                    if (showBackBtn)
+                      BackBtn(
+                        onPressed: onBack,
+                        icon: backIcon,
+                        semanticLabel: backBtnSemantics,
+                      ),
                     Spacer(),
                     if (trailing != null) trailing!.call(context),
                     Gap($styles.insets.sm),

lib/ui/common/modals/fullscreen_maps_viewer.dart

@@ -1,6 +1,7 @@
 import 'package:google_maps_flutter/google_maps_flutter.dart';
 import 'package:wonders/common_libs.dart';
 import 'package:wonders/logic/data/wonder_data.dart';
+import 'package:wonders/ui/common/controls/app_header.dart';
 import 'package:wonders/ui/common/google_maps_marker.dart';
 
 class FullscreenMapsViewer extends StatelessWidget {
@@ -20,7 +21,7 @@ class FullscreenMapsViewer extends StatelessWidget {
           initialCameraPosition: startPos,
           myLocationButtonEnabled: false,
         ),
-        BackBtn().safe(),
+        AppHeader(isTransparent: true),
       ],
     );
   }

lib/ui/common/modals/fullscreen_url_img_viewer.dart

@@ -1,4 +1,5 @@
 import 'package:wonders/common_libs.dart';
+import 'package:wonders/ui/common/controls/app_header.dart';
 import 'package:wonders/ui/common/utils/app_haptics.dart';
 
 class FullscreenUrlImgViewer extends StatefulWidget {
@@ -52,7 +53,7 @@ class _FullscreenUrlImgViewerState extends State<FullscreenUrlImgViewer> {
       child: Stack(
         children: [
           Positioned.fill(child: content),
-          BackBtn.close(onPressed: _handleBackPressed).safe(),
+          AppHeader(onBack: _handleBackPressed, isTransparent: true),
         ],
       ),
     );

lib/ui/screens/artifact/artifact_details/artifact_details_screen.dart

@@ -1,6 +1,7 @@
 import 'package:wonders/common_libs.dart';
 import 'package:wonders/logic/data/artifact_data.dart';
 import 'package:wonders/ui/common/compass_divider.dart';
+import 'package:wonders/ui/common/controls/app_header.dart';
 import 'package:wonders/ui/common/controls/app_loading_indicator.dart';
 import 'package:wonders/ui/common/gradient_container.dart';
 import 'package:wonders/ui/common/modals/fullscreen_url_img_viewer.dart';
@@ -56,7 +57,7 @@ class _ArtifactDetailsScreenState extends State<ArtifactDetailsScreen> {
 
           return Stack(children: [
             content,
-            BackBtn().safe(),
+            AppHeader(isTransparent: true),
           ]);
         },
       ),

lib/ui/screens/collectible_found/collectible_found_screen.dart

@@ -3,6 +3,7 @@ import 'package:wonders/common_libs.dart';
 import 'package:wonders/logic/data/collectible_data.dart';
 import 'package:wonders/ui/common/app_backdrop.dart';
 import 'package:wonders/ui/common/centered_box.dart';
+import 'package:wonders/ui/common/controls/app_header.dart';
 import 'package:wonders/ui/common/pop_navigator_underlay.dart';
 
 part 'widgets/_animated_ribbon.dart';
@@ -91,7 +92,7 @@ class CollectibleFoundScreen extends StatelessWidget {
           ),
         ),
       ),
-      BackBtn.close().safe().animate().fade(delay: t * 4, duration: t * 2),
+      AppHeader(isTransparent: true).animate().fade(delay: t * 4, duration: t * 2),
     ]);
   }
 

lib/ui/screens/home/wonders_home_screen.dart

@@ -1,6 +1,7 @@
 import 'package:wonders/common_libs.dart';
 import 'package:wonders/logic/data/wonder_data.dart';
 import 'package:wonders/ui/common/app_icons.dart';
+import 'package:wonders/ui/common/controls/app_header.dart';
 import 'package:wonders/ui/common/controls/app_page_indicator.dart';
 import 'package:wonders/ui/common/gradient_container.dart';
 import 'package:wonders/ui/common/themed_text.dart';
@@ -324,12 +325,11 @@ class _HomeScreenState extends State<HomeScreen> with SingleTickerProviderStateM
         child: AnimatedOpacity(
           duration: $styles.times.fast,
           opacity: _isMenuOpen ? 0 : 1,
-          child: MergeSemantics(
-            child: CircleIconBtn(
-              icon: AppIcons.menu,
-              onPressed: _handleOpenMenuPressed,
-              semanticLabel: $strings.homeSemanticOpenMain,
-            ).safe(),
+          child: AppHeader(
+            backIcon: AppIcons.menu,
+            backBtnSemantics: $strings.homeSemanticOpenMain,
+            onBack: _handleOpenMenuPressed,
+            isTransparent: true,
           ),
         ),
       ),

lib/ui/screens/home_menu/home_menu.dart

@@ -4,6 +4,7 @@ import 'package:wonders/common_libs.dart';
 import 'package:wonders/logic/data/wonder_data.dart';
 import 'package:wonders/ui/common/app_backdrop.dart';
 import 'package:wonders/ui/common/app_icons.dart';
+import 'package:wonders/ui/common/controls/app_header.dart';
 import 'package:wonders/ui/common/controls/locale_switcher.dart';
 import 'package:wonders/ui/common/pop_navigator_underlay.dart';
 import 'package:wonders/ui/screens/home_menu/about_dialog_content.dart';
@@ -58,22 +59,9 @@ class _HomeMenuState extends State<HomeMenu> {
 
         PopNavigatorUnderlay(),
 
-        SafeArea(
-          child: PaddedRow(
-            padding: EdgeInsets.symmetric(
-              horizontal: $styles.insets.md,
-              vertical: $styles.insets.sm,
-            ),
-            children: [
-              /// Back btn
-              BackBtn.close(
-                bgColor: Colors.transparent,
-                iconColor: $styles.colors.offWhite,
-              ),
-              Spacer(),
-              LocaleSwitcher()
-            ],
-          ),
+        AppHeader(
+          isTransparent: true,
+          trailing: (_) => LocaleSwitcher(),
         ),
 
         /// Content

lib/ui/screens/photo_gallery/photo_gallery.dart

@@ -134,7 +134,6 @@ class _PhotoGalleryState extends State<PhotoGallery> {
           if (value.isEmpty) {
             return Center(child: AppLoadingIndicator());
           }
-
           Size imgSize = context.isLandscape
               ? Size(context.widthPx * .5, context.heightPx * .66)
               : Size(context.widthPx * .66, context.heightPx * .5);