refactor: Fix linter issues

kiosk_mode/example/lib/main.dart

@@ -36,11 +36,7 @@ class _HomeState extends State<_Home> {
 
   void _handleStart(bool didStart) {
     if (!didStart && Platform.isIOS) {
-      _showSnackBar(
-        'Single App mode is supported only for devices that are supervised'
-        ' using Mobile Device Management (MDM) and the app itself must'
-        ' be enabled for this mode by MDM.',
-      );
+      _showSnackBar(_unsupportedMessage);
     }
   }
 
@@ -97,3 +93,9 @@ class _HomeState extends State<_Home> {
         },
       );
 }
+
+const _unsupportedMessage = '''
+Single App mode is supported only for devices that are supervised 
+using Mobile Device Management (MDM) and the app itself must 
+be enabled for this mode by MDM.
+''';

optimus/lib/src/chat/bubble.dart

@@ -72,8 +72,10 @@ class _Date extends StatelessWidget {
       direction: Axis.horizontal,
       spacing: OptimusStackSpacing.spacing100,
       children: [
+        // ignore: avoid-flexible-outside-flex, it is wrapped in Flex latter
         Expanded(child: horizontalLine),
         Text(date, style: tokens.bodySmallStrong),
+        // ignore: avoid-flexible-outside-flex, it is wrapped in Flex latter
         Expanded(child: horizontalLine),
       ],
     );

optimus/lib/src/chat/chat.dart

@@ -125,6 +125,7 @@ class OptimusChat extends StatelessWidget {
       child: OptimusStack(
         spacing: OptimusStackSpacing.spacing200,
         children: [
+          // ignore: avoid-flexible-outside-flex, it is wrapped in Flex later
           Expanded(
             child: ListView.builder(
               itemCount: _messages.length,

optimus/lib/src/dialogs/dialog_content.dart

@@ -41,8 +41,8 @@ class DialogContent extends StatelessWidget {
     final title = this.title;
     final content = this.content;
 
-    return Container(
-      margin: margin,
+    return Padding(
+      padding: margin ?? EdgeInsets.zero,
       child: Padding(
         padding: EdgeInsets.all(spacing ?? tokens.spacing0),
         child: ConstrainedBox(

optimus/lib/src/dropdown/dropdown.dart

@@ -163,7 +163,7 @@ class _DropdownContentState<T> extends State<_DropdownContent<T>>
                 child: _buildList(isOnTop, listMaxHeight),
               ),
             )
-          : widget.emptyResultPlaceholder ?? const SizedBox.shrink();
+          : (widget.emptyResultPlaceholder ?? const SizedBox.shrink());
       final children = [
         Material(color: Colors.transparent, child: content),
         if (widget.embeddedSearch case final embeddedSearch?)

optimus/lib/src/expansion/expansion_tile.dart

@@ -173,7 +173,7 @@ class _OptimusExpansionTileState extends State<OptimusExpansionTile>
                 child: listTile,
               ),
             ClipRect(
-              child: Align(heightFactor: _heightFactor.value, child: child),
+              child: Center(heightFactor: _heightFactor.value, child: child),
             ),
           ],
         );

optimus/lib/src/form/input_field.dart

@@ -348,6 +348,7 @@ class _OptimusInputFieldState extends State<OptimusInputField>
       placeholder:
           _placeholder, // TODO(witwash): rework when https://github.com/flutter/flutter/issues/138794 is fixed
       children: [
+        // ignore: avoid-flexible-outside-flex, it is wrapped in Row later
         Expanded(
           child: CupertinoTextField(
             key: widget.inputKey,

optimus/lib/src/form/multiselect_field.dart

@@ -123,6 +123,7 @@ class _OptimusMultiSelectInputFieldState extends State<MultiSelectInputField>
           fieldBoxKey: widget.fieldBoxKey,
           size: widget.size,
           children: [
+            // ignore: avoid-flexible-outside-flex, it is wrapped in Row later
             Flexible(
               child: Focus(
                 focusNode: _effectiveFocusNode,

optimus/lib/src/loader/spinner.dart

@@ -99,9 +99,8 @@ class _OptimusSpinnerState extends State<OptimusSpinner>
   }
 
   @override
-  Widget build(BuildContext context) => SizedBox(
-        width: widget.size.getSize(tokens),
-        height: widget.size.getSize(tokens),
+  Widget build(BuildContext context) => SizedBox.square(
+        dimension: widget.size.getSize(tokens),
         child: AnimatedBuilder(
           animation: _controller,
           builder: (context, child) => Stack(

optimus/lib/src/logo.dart

@@ -92,8 +92,8 @@ class OptimusMewsLogo extends StatelessWidget {
   Widget build(BuildContext context) {
     final tokens = context.tokens;
 
-    return Container(
-      margin: _getMargin(tokens),
+    return Padding(
+      padding: _getMargin(tokens),
       child: switch (logoVariant) {
         OptimusMewsLogoVariant.logomark => _NonSquaredIcon(
             OptimusIcons.mews_logo,

optimus/lib/src/pictogram/pictogram.dart

@@ -20,9 +20,8 @@ class OptimusPictogram extends StatelessWidget {
   final OptimusPictogramSize size;
 
   @override
-  Widget build(BuildContext context) => SizedBox(
-        width: size.getSize(context.tokens),
-        height: size.getSize(context.tokens),
+  Widget build(BuildContext context) => SizedBox.square(
+        dimension: size.getSize(context.tokens),
         child: SvgPicture.asset(
           variant.path(context.theme.brightness),
           package: 'optimus',

optimus/lib/src/progress_indicator/progress_indicator_item.dart

@@ -263,9 +263,8 @@ class _DisabledIndicatorItem extends StatelessWidget {
     final tokens = context.tokens;
     final size = tokens.sizing300;
 
-    return SizedBox(
-      height: size,
-      width: size,
+    return SizedBox.square(
+      dimension: size,
       child: Center(
         child: Container(
           constraints: BoxConstraints(

optimus/lib/src/selection_card.dart

@@ -283,7 +283,7 @@ class _VerticalCard extends StatelessWidget {
               top: context.tokens.spacing100,
               child: selector,
             ),
-          Container(
+          Padding(
             padding: EdgeInsets.symmetric(
               horizontal: context.tokens.spacing200,
               vertical: context.tokens.spacing400,

optimus/lib/src/theme/theme.dart

@@ -32,8 +32,8 @@ class OptimusTheme extends StatelessWidget {
     final bool isDark = themeMode == ThemeMode.dark ||
         (themeMode == ThemeMode.system && brightness == Brightness.dark);
     final theme = isDark
-        ? darkTheme ?? _defaultDarkTheme
-        : lightTheme ?? _defaultLightTheme;
+        ? (darkTheme ?? _defaultDarkTheme)
+        : (lightTheme ?? _defaultLightTheme);
 
     return _OptimusTheme(
       theme: theme,

optimus/lib/src/toggle.dart

@@ -126,9 +126,8 @@ class _Knob extends StatelessWidget {
     final tokens = context.tokens;
     final knobSize = tokens.sizing200;
 
-    return SizedBox(
-      width: knobSize,
-      height: knobSize,
+    return SizedBox.square(
+      dimension: knobSize,
       child: DecoratedBox(
         decoration: ShapeDecoration(
           color: tokens.backgroundStaticFlat,

optimus/lib/src/tooltip/tooltip_wrapper.dart

@@ -54,6 +54,9 @@ class _OptimusTooltipWrapperState extends State<OptimusTooltipWrapper> {
           tooltipPosition: widget.tooltipPosition,
           content: widget.text,
         ),
-        child: Container(key: _anchorKey, child: widget.child),
+        child: KeyedSubtree(
+          key: _anchorKey,
+          child: widget.child,
+        ),
       );
 }

optimus_icons/utils/gen_icons.dart

@@ -66,8 +66,8 @@ void main(List<String> arguments) {
         )
         ..writeln('const optimusIcons = <IconDetails>[');
 
-      for (int i = 0; i < icons.length; i++) {
-        final Map<String, dynamic> glyphs = icons[i] as Map<String, dynamic>;
+      for (final icon in icons) {
+        final Map<String, dynamic> glyphs = icon as Map<String, dynamic>;
         final glyphName = convertGlyphName(glyphs['css'].toString());
         buffer.writeln(
           "    IconDetails($fontFamilyName.$glyphName, '$glyphName'),",

optimus_widgetbook/lib/components/layout/spacing.dart

@@ -36,9 +36,8 @@ Widget _buildSpacing(OptimusTokens tokens, double spacing, String label) =>
       padding: const EdgeInsets.symmetric(horizontal: 24, vertical: 12),
       child: Row(
         children: [
-          SizedBox(
-            width: spacing,
-            height: spacing,
+          SizedBox.square(
+            dimension: spacing,
             child: Container(color: Colors.black),
           ),
           Padding(