refactor(ui): QueryaSpinner, QueryaBadge and the tree loading row off shadcn

lib/shared/widgets/connection_tree_loading_row.dart

@@ -1,6 +1,6 @@
 import 'package:flutter/material.dart' as material;
+import 'package:querya_desktop/core/theme/querya_theme_scope.dart';
 import 'package:querya_desktop/core/ui/querya_tree_tokens.dart';
-import 'package:shadcn_flutter/shadcn_flutter.dart';
 
 import 'querya_spinner.dart';
 
@@ -38,8 +38,17 @@ class ConnectionTreeLoadingRow extends material.StatelessWidget {
             customDimension: spinnerSize,
             strokeWidth: strokeWidth,
           ),
-          Gap(gap),
-          Text(label).muted().xSmall(),
+          material.SizedBox(width: gap),
+          material.Text(
+            label,
+            style: material.DefaultTextStyle.of(context).style.copyWith(
+                  fontSize: 12,
+                  color: QueryaThemeScope.maybeOf(context)
+                          ?.workbench
+                          .mutedForeground ??
+                      material.Theme.of(context).colorScheme.onSurfaceVariant,
+                ),
+          ),
         ],
       ),
     );

lib/shared/widgets/querya_badge.dart

@@ -1,5 +1,4 @@
 import 'package:flutter/material.dart' as material;
-import 'package:shadcn_flutter/shadcn_flutter.dart';
 import 'package:querya_desktop/core/theme/querya_theme_scope.dart';
 
 /// Semantic status variant for [QueryaBadge.status].
@@ -106,7 +105,7 @@ class QueryaBadge extends material.StatelessWidget {
 
   @override
   material.Widget build(material.BuildContext context) {
-    final cs = Theme.of(context).colorScheme;
+    final cs = context.queryaTheme.colorScheme;
     final workbench = QueryaThemeScope.maybeOf(context)?.workbench;
     final palette = context.semanticPalette;
 
@@ -197,7 +196,7 @@ class QueryaBadge extends material.StatelessWidget {
               ),
               child: effectiveIcon,
             ),
-            const Gap(4),
+            const material.SizedBox(width: 4),
           ],
           material.Text(
             effectiveLabel,

lib/shared/widgets/querya_spinner.dart

@@ -1,5 +1,4 @@
 import 'package:flutter/material.dart' as material;
-import 'package:shadcn_flutter/shadcn_flutter.dart';
 import 'package:querya_desktop/core/theme/querya_theme_scope.dart';
 
 /// Preset sizes for the [QueryaSpinner] indicator.
@@ -47,12 +46,13 @@ class QueryaSpinner extends material.StatelessWidget {
 
   @override
   material.Widget build(material.BuildContext context) {
-    final cs = Theme.of(context).colorScheme;
-    final workbench = QueryaThemeScope.maybeOf(context)?.workbench;
+    final theme = QueryaThemeScope.maybeOf(context);
+    final workbench = theme?.workbench;
+    final fallback = material.Theme.of(context).colorScheme;
 
     final dimension = customDimension ?? size.dimension;
     final stroke = strokeWidth ?? size.strokeWidth;
-    final effectiveColor = color ?? workbench?.accent ?? cs.primary;
+    final effectiveColor = color ?? workbench?.accent ?? fallback.primary;
 
     final spinner = material.SizedBox(
       width: dimension,
@@ -72,12 +72,12 @@ class QueryaSpinner extends material.StatelessWidget {
       crossAxisAlignment: material.CrossAxisAlignment.center,
       children: [
         spinner,
-        const Gap(8),
+        const material.SizedBox(width: 8),
         material.Text(
           label!,
           style: material.TextStyle(
             fontSize: size == QueryaSpinnerSize.sm ? 11 : 12,
-            color: workbench?.mutedForeground ?? cs.mutedForeground,
+            color: workbench?.mutedForeground ?? fallback.onSurfaceVariant,
           ),
         ),
       ],

test/guards/shared_does_not_import_shadcn_test.dart

@@ -12,18 +12,15 @@ import 'package:flutter_test/flutter_test.dart';
 void main() {
   const allowed = <String>{
     'lib/shared/widgets/app_toast.dart',
-    'lib/shared/widgets/connection_tree_loading_row.dart',
     'lib/shared/widgets/export_menu_button.dart',
     'lib/shared/widgets/querya_action_button.dart',
     'lib/shared/widgets/querya_action_menu.dart',
-    'lib/shared/widgets/querya_badge.dart',
     'lib/shared/widgets/querya_dialog_card.dart',
     'lib/shared/widgets/querya_dropdown.dart',
     'lib/shared/widgets/querya_empty_state.dart',
     'lib/shared/widgets/querya_icon_button.dart',
     'lib/shared/widgets/querya_modal_dialog.dart',
     'lib/shared/widgets/querya_search_field.dart',
-    'lib/shared/widgets/querya_spinner.dart',
     'lib/shared/widgets/querya_tab_strip.dart',
     'lib/shared/widgets/widgets.dart',
   };