refactor: Fix linter issues

Author: witwash

optimus/lib/src/badge/base_badge.dart

@@ -39,9 +39,7 @@ class BaseBadge extends StatelessWidget {
     final decoration = BoxDecoration(
       borderRadius: const .all(.circular(50)),
       color: backgroundColor,
-      border: isOutlined
-          ? Border.all(width: outlineSize, color: outlineColor)
-          : null,
+      border: isOutlined ? .all(width: outlineSize, color: outlineColor) : null,
     );
 
     final child = hasText

optimus/lib/src/button/base_button.dart

@@ -216,7 +216,7 @@ class _ButtonContentState extends State<_ButtonContent> with ThemeGetter {
             if (widget.leadingIcon case final leadingIcon?)
               Padding(
                 padding: widget.child != null
-                    ? EdgeInsets.only(right: insideHorizontalPadding)
+                    ? .only(right: insideHorizontalPadding)
                     : EdgeInsets.zero,
                 child: Icon(
                   leadingIcon,

optimus/lib/src/button/icon.dart

@@ -1,3 +1,4 @@
+import 'package:dfunc/dfunc.dart';
 import 'package:flutter/material.dart';
 import 'package:optimus/optimus.dart';
 import 'package:optimus/src/button/base_button_variant.dart';
@@ -93,12 +94,9 @@ class _OptimusIconButtonState extends State<OptimusIconButton>
                   isPressed: _isPressed,
                   isHovered: _isHovered,
                 ),
-                border: borderColor != null
-                    ? Border.all(
-                        color: borderColor,
-                        width: tokens.borderWidth100,
-                      )
-                    : null,
+                border: borderColor?.let(
+                  (it) => Border.all(color: it, width: tokens.borderWidth100),
+                ),
                 borderRadius: .all(tokens.borderRadius100),
               ),
               duration: buttonAnimationDuration,

optimus/lib/src/checkbox/checkbox_tick.dart

@@ -102,7 +102,7 @@ class _CheckboxTickState extends State<CheckboxTick> with ThemeGetter {
           decoration: BoxDecoration(
             color: _fillColor.resolve(_controller.value),
             border: _state.isUnchecked
-                ? Border.all(
+                ? .all(
                     color: _borderColor.resolve(_controller.value),
                     width: tokens.borderWidth100,
                   )

optimus/lib/src/feedback/banner.dart

@@ -102,7 +102,7 @@ class OptimusBanner extends StatelessWidget {
                         children: [
                           Padding(
                             padding: isDismissible
-                                ? EdgeInsets.only(right: tokens.spacing200)
+                                ? .only(right: tokens.spacing200)
                                 : EdgeInsets.zero,
                             child: FeedbackTitle(
                               title: title,

optimus/lib/src/tag.dart

@@ -164,7 +164,7 @@ class _Tag extends StatelessWidget {
       decoration: BoxDecoration(
         color: isOutlined ? tokens.backgroundStaticFlat : backgroundColor,
         border: isOutlined
-            ? Border.all(
+            ? .all(
                 color: borderColor,
                 width: tokens.borderWidth100,
                 style: .solid,