phase3(critical-path): store + main + routes + nav components null-safe

- store/state + reducers: nullable AppState fields & reducer types
- main.dart: localeResolutionCallback Locale?, settings.name? guard
- routes.dart: fluro 2.0.5 HandlerFunc (BuildContext?) + params['x']!
- navigationbar/breadcrumbs/bottom_nav/text_link: nullable optional params/fields

lib/widgets/general/bottom_nav.dart

@@ -2,7 +2,7 @@
 import 'package:flutter/material.dart';
 
 class BottomNav extends StatefulWidget {
-  const BottomNav({Key key}) : super(key: key);
+  const BottomNav({Key? key}) : super(key: key);
 
   @override
   State<StatefulWidget> createState() {

lib/widgets/general/breadcrumbs.dart

@@ -7,10 +7,10 @@ import '../../routes.dart';
 import 'navigationbar.dart';
 
 class BreadCrumbs extends StatelessWidget {
-  final List<BreadCrumb> breadCrumbs;
+  final List<BreadCrumb>? breadCrumbs;
   final bool hasBack;
-  final OnBackPress onBackPress;
-  const BreadCrumbs(this.hasBack, {this.breadCrumbs, Key key, this.onBackPress}) : super(key: key);
+  final OnBackPress? onBackPress;
+  const BreadCrumbs(this.hasBack, {this.breadCrumbs, Key? key, this.onBackPress}) : super(key: key);
 
   @override
   Widget build(BuildContext context) {
@@ -49,11 +49,11 @@ class BreadCrumbs extends StatelessWidget {
       ));
     }
     if (breadCrumbs != null) {
-      for (int i = 0; i < breadCrumbs.length; i++) {
-        BreadCrumb breadCrumb = breadCrumbs[i];
+      for (int i = 0; i < breadCrumbs!.length; i++) {
+        BreadCrumb breadCrumb = breadCrumbs![i];
         if (breadCrumb.text == null && breadCrumb.item != null) {
           if (breadCrumb.onTap == null) {
-            widgets.add(breadCrumb.item);
+            widgets.add(breadCrumb.item!);
           } else {
             widgets.add(MouseRegion(
               cursor: SystemMouseCursors.click,
@@ -186,9 +186,9 @@ class BreadCrumbs extends StatelessWidget {
 class BreadCrumb {
   final String text;
   final String route;
-  final IconData icon;
-  final Widget item;
-  final Function onTap;
+  final IconData? icon;
+  final Widget? item;
+  final GestureTapCallback? onTap;
 
   BreadCrumb(this.text, this.route, {this.icon, this.item, this.onTap});
 }

lib/widgets/general/navigationbar.dart

@@ -9,17 +9,17 @@ import 'breadcrumbs.dart';
 typedef OnBackPress();
 
 class MiniNavigationBar extends StatefulWidget implements PreferredSizeWidget {
-  final Key key;
+  final Key? key;
   final String title;
   final bool back;
   final bool toHome;
   final bool showMe;
-  final List<BreadCrumb> breadCrumbs;
-  final double breadCrumbHeight;
-  final Widget shoppingCart;
+  final List<BreadCrumb>? breadCrumbs;
+  final double? breadCrumbHeight;
+  final Widget? shoppingCart;
 
-  MiniNavigationBar({Key key, PreferredSizeWidget bottom, String title,
-    bool back, bool toHome, bool showMe, this.breadCrumbs,
+  MiniNavigationBar({Key? key, PreferredSizeWidget? bottom, String? title,
+    bool? back, bool? toHome, bool? showMe, this.breadCrumbs,
     this.breadCrumbHeight, this.shoppingCart})
       : key = key,
         preferredSize = breadCrumbHeight != null ? Size.fromHeight(kToolbarHeight + breadCrumbHeight) :
@@ -47,9 +47,9 @@ class MiniNavigationBarState extends State<MiniNavigationBar> {
       mobile: MobileNavigationBar(title: widget.title, back: widget.back,
         toHome: widget.toHome, showMe: widget.showMe,),
       tablet: DesktopNavigationBar(hasBack: widget.back,
-        breadCrumbs: widget.breadCrumbs, shoppingCart: widget.shoppingCart,),
+        breadCrumbs: widget.breadCrumbs ?? [], shoppingCart: widget.shoppingCart ?? const SizedBox.shrink(),),
       desktop: DesktopNavigationBar(hasBack: widget.back,
-        breadCrumbs: widget.breadCrumbs, shoppingCart: widget.shoppingCart,),
+        breadCrumbs: widget.breadCrumbs ?? [], shoppingCart: widget.shoppingCart ?? const SizedBox.shrink(),),
     );
   }
 

lib/widgets/general/text_link.dart

@@ -11,22 +11,22 @@ import '../../routes.dart';
 class TextLink extends StatelessWidget {
   final String title;
   final String url;
-  final Color color;
-  final Color hoverColor;
-  final double paddingHorizontal;
-  final double paddingVertical;
-  final FontWeight fontWeight;
-  final bool selected;
+  final Color? color;
+  final Color? hoverColor;
+  final double? paddingHorizontal;
+  final double? paddingVertical;
+  final FontWeight? fontWeight;
+  final bool? selected;
   final bool isLink;
   final bool replace;
   final bool clearStack;
   final bool maintainState;
   final bool rootNavigator;
-  final TransitionType transition;
+  final TransitionType? transition;
   final bool closeDrawer;
   final bool isEmail;
   final bool isPhone;
-  final double fontSize;
+  final double? fontSize;
   final bool isAddress;
   final TextOverflow overflow;
   final int maxLines;
@@ -38,19 +38,19 @@ class TextLink extends StatelessWidget {
     this.paddingVertical,
     this.fontWeight,
     this.selected,
-    bool isLink,
-    bool replace,
-    bool clearStack,
-    bool maintainState,
-    bool rootNavigator,
+    bool? isLink,
+    bool? replace,
+    bool? clearStack,
+    bool? maintainState,
+    bool? rootNavigator,
     this.transition,
-    bool closeDrawer,
-    bool isEmail,
-    bool isPhone,
-    double fontSize,
-    bool isAddress,
-    TextOverflow overflow,
-    int maxLines,
+    bool? closeDrawer,
+    bool? isEmail,
+    bool? isPhone,
+    double? fontSize,
+    bool? isAddress,
+    TextOverflow? overflow,
+    int? maxLines,
   }) :
         isLink = isLink ?? false,
         replace = replace ?? false,
@@ -60,7 +60,7 @@ class TextLink extends StatelessWidget {
         closeDrawer = closeDrawer ?? false,
         isEmail = isEmail ?? false,
         isPhone = isPhone ?? false,
-        fontSize = fontSize ?? null,
+        fontSize = fontSize,
         isAddress = isAddress ?? false,
         overflow = overflow ?? TextOverflow.ellipsis,
         maxLines = maxLines ?? 1;
@@ -101,7 +101,7 @@ class TextLink extends StatelessWidget {
             },
           ),
           decoration: BoxDecoration(
-            border: (selected != null && selected) ? Border(
+            border: (selected == true) ? Border(
                 bottom: BorderSide(
                   color: color ?? Colors.blue,
                   width: 3.0,
@@ -110,7 +110,7 @@ class TextLink extends StatelessWidget {
           ),
         ),
         onTap: () async {
-          if (selected == null || !selected) {
+          if (selected != true) {
             if (isEmail) {
               Utils.openEmail(url);
             } else if (isPhone) {