refactor(ui): QueryaDropdown and QueryaDialogCard off shadcn

lib/core/theme/querya_theme.dart

@@ -6,6 +6,10 @@ import 'querya_colors.dart';
 import 'querya_editor_theme.dart';
 import 'querya_workbench_theme.dart';
 
+/// The type of [QueryaTheme.colorScheme], nameable by widgets that must not
+/// import the UI library behind it.
+typedef QueryaThemeColorScheme = ColorScheme;
+
 /// Full Querya theme: workbench chrome + editor tokens + shadcn [ColorScheme].
 class QueryaTheme {
   const QueryaTheme({

lib/core/ui/querya_control_tokens.dart

@@ -20,6 +20,9 @@ abstract final class QueryaControlMetrics {
   /// One corner radius for buttons, icon buttons, dropdown triggers, search
   /// fields and tab pills.
   static const double radius = 6;
+
+  /// Corner radius of dialog cards and other floating surfaces.
+  static const double surfaceRadius = 14;
 }
 
 /// One of the three control sizes of the Querya UI kit. Buttons, icon buttons,

lib/shared/widgets/querya_dialog_card.dart

@@ -1,5 +1,6 @@
 import 'package:flutter/material.dart' as material;
-import 'package:shadcn_flutter/shadcn_flutter.dart';
+import 'package:querya_desktop/core/theme/querya_theme_scope.dart';
+import 'package:querya_desktop/core/ui/querya_control_tokens.dart';
 
 /// Dialog shell: [Material] popover fill (ListTile ink host) under the same
 /// [Container] constraints as the pre-migration shell.
@@ -21,8 +22,8 @@ class QueryaDialogCard extends material.StatelessWidget {
 
   @override
   material.Widget build(material.BuildContext context) {
-    final theme = Theme.of(context).colorScheme;
-    final radius = Theme.of(context).radiusXxl;
+    final theme = context.colors;
+    const radius = QueryaControlMetrics.surfaceRadius;
     final borderRadius = material.BorderRadius.circular(radius);
     final textStyle = material.DefaultTextStyle.of(context).style;
     final iconTheme = material.IconTheme.of(context);

lib/shared/widgets/querya_dropdown.dart

@@ -6,9 +6,10 @@ import 'package:flutter/services.dart';
 import 'package:querya_desktop/core/layout/ui_scale.dart';
 import 'package:querya_desktop/core/motion/querya_motion.dart';
 import 'package:querya_desktop/core/motion/querya_motion_context.dart';
+import 'package:querya_desktop/core/theme/querya_theme.dart';
+import 'package:querya_desktop/core/theme/querya_theme_scope.dart';
 import 'package:querya_desktop/core/ui/querya_control_tokens.dart';
 import 'package:querya_desktop/shared/widgets/querya_dropdown_tokens.dart';
-import 'package:shadcn_flutter/shadcn_flutter.dart';
 
 export 'querya_dropdown_tokens.dart';
 
@@ -29,7 +30,7 @@ class QueryaDropdownItem<T> {
 
 /// Stable dropdown built on [material.MenuAnchor] (no Overlay portal).
 ///
-/// Visual metrics: [QueryaDropdownTokens]. Colors from shadcn [ColorScheme].
+/// Visual metrics: [QueryaDropdownTokens]. Colors from shadcn [QueryaThemeColorScheme].
 ///
 /// **Exit motion:** item pick and trigger-toggle delay [MenuController.close]
 /// so fade-slide can run. Outside-tap / focus-loss closes via [MenuAnchor]
@@ -148,7 +149,7 @@ class _QueryaDropdownState<T> extends material.State<QueryaDropdown<T>> {
     return QueryaControlScope.maybeOf(context) ?? QueryaControlSize.lg;
   }
 
-  List<material.Widget> _menuChildren(ColorScheme cs, QueryaControlSize size) {
+  List<material.Widget> _menuChildren(QueryaThemeColorScheme cs, QueryaControlSize size) {
     if (_cachedMenuChildren != null &&
         listEquals(_cachedMenuItems, widget.items) &&
         _cachedMenuValue == widget.value &&
@@ -167,7 +168,7 @@ class _QueryaDropdownState<T> extends material.State<QueryaDropdown<T>> {
   material.Widget _triggerLabelText({
     required material.BuildContext context,
     required String label,
-    required ColorScheme cs,
+    required QueryaThemeColorScheme cs,
     required bool expand,
     required QueryaControlSize size,
   }) {
@@ -199,7 +200,7 @@ class _QueryaDropdownState<T> extends material.State<QueryaDropdown<T>> {
 
   material.Widget _menuItem(
     QueryaDropdownItem<T> item,
-    ColorScheme cs,
+    QueryaThemeColorScheme cs,
     QueryaControlSize size,
   ) {
     return _QueryaDropdownMenuItem<T>(
@@ -219,7 +220,7 @@ class _QueryaDropdownState<T> extends material.State<QueryaDropdown<T>> {
   material.Widget _buildTrigger({
     required material.BuildContext context,
     required material.MenuController controller,
-    required ColorScheme cs,
+    required QueryaThemeColorScheme cs,
     required String label,
     required double? fieldWidth,
   }) {
@@ -303,18 +304,18 @@ class _QueryaDropdownState<T> extends material.State<QueryaDropdown<T>> {
       onFocusChange: (f) => setState(() => _triggerFocused = f),
       onKeyEvent: (node, event) {
         if (!widget.enabled || event is! KeyDownEvent) {
-          return KeyEventResult.ignored;
+          return material.KeyEventResult.ignored;
         }
         final k = event.logicalKey;
         if (k == LogicalKeyboardKey.enter ||
             k == LogicalKeyboardKey.space ||
             k == LogicalKeyboardKey.arrowDown) {
           if (!controller.isOpen) {
             controller.open();
-            return KeyEventResult.handled;
+            return material.KeyEventResult.handled;
           }
         }
-        return KeyEventResult.ignored;
+        return material.KeyEventResult.ignored;
       },
       child: material.GestureDetector(
         behavior: material.HitTestBehavior.opaque,
@@ -339,7 +340,7 @@ class _QueryaDropdownState<T> extends material.State<QueryaDropdown<T>> {
 
   @override
   material.Widget build(material.BuildContext context) {
-    final cs = Theme.of(context).colorScheme;
+    final cs = context.colors;
     final label = _labelFor(widget.value);
     final fieldWidth = widget.expandToParent
         ? null
@@ -501,7 +502,7 @@ class _QueryaDropdownMenuItem<T> extends material.StatefulWidget {
   final QueryaDropdownItem<T> item;
   final bool selected;
   final bool enabled;
-  final ColorScheme colorScheme;
+  final QueryaThemeColorScheme colorScheme;
   final bool compact;
   final QueryaControlSize size;
   final material.VoidCallback onPick;
@@ -516,7 +517,7 @@ class _QueryaDropdownMenuItemState<T>
   bool _hovered = false;
   bool _focused = false;
 
-  material.Widget _leading(material.BuildContext context, ColorScheme cs) {
+  material.Widget _leading(material.BuildContext context, QueryaThemeColorScheme cs) {
     final slot = context.scaled(QueryaDropdownTokens.selectedCheckSlotWidth);
     final checkSize = context.scaled(QueryaDropdownTokens.selectedCheckSize);
     if (widget.selected) {

test/guards/shared_does_not_import_shadcn_test.dart

@@ -15,8 +15,6 @@ void main() {
     '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_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',