feat: add MCP support (#1471)

ui/flutter/lib/shared/widgets/app_copy_icon_button.dart

@@ -0,0 +1,59 @@
+import 'package:flutter/material.dart' show Icons;
+import 'package:flutter/services.dart';
+import 'package:flutter/widgets.dart';
+import 'package:shadcn_flutter/shadcn_flutter.dart' as shad;
+
+import '../../l10n/l10n.dart';
+import 'app_tooltip.dart';
+
+class AppCopyIconButton extends StatefulWidget {
+  const AppCopyIconButton({
+    super.key,
+    required this.text,
+    this.enabled = true,
+    this.dimension = 28,
+    this.iconSize = 16,
+  });
+
+  final String text;
+  final bool enabled;
+  final double dimension;
+  final double iconSize;
+
+  @override
+  State<AppCopyIconButton> createState() => _AppCopyIconButtonState();
+}
+
+class _AppCopyIconButtonState extends State<AppCopyIconButton> {
+  bool _copied = false;
+
+  @override
+  void didUpdateWidget(covariant AppCopyIconButton oldWidget) {
+    super.didUpdateWidget(oldWidget);
+    if (widget.text != oldWidget.text || (!widget.enabled && oldWidget.enabled)) {
+      _copied = false;
+    }
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return AppTooltip(
+      message: _copied ? context.l10n.copied : context.l10n.copy,
+      child: SizedBox.square(
+        dimension: widget.dimension,
+        child: shad.IconButton.ghost(
+          size: shad.ButtonSize.xSmall,
+          onPressed: widget.enabled ? _copy : null,
+          icon: Icon(_copied ? Icons.check : Icons.copy_outlined, size: widget.iconSize),
+        ),
+      ),
+    );
+  }
+
+  Future<void> _copy() async {
+    await Clipboard.setData(ClipboardData(text: widget.text));
+    if (mounted) {
+      setState(() => _copied = true);
+    }
+  }
+}

ui/flutter/lib/shared/widgets/app_loading_button.dart

@@ -31,20 +31,28 @@ class AppLoadingButton extends StatelessWidget {
     final replaceChild = loading && icon == null;
     final leading = loading && icon != null ? _LoadingIcon(variant: variant) : icon;
     final effectiveChild = replaceChild ? _LoadingIcon(variant: variant) : child;
+    final content = leading == null
+        ? effectiveChild
+        : Row(
+            mainAxisSize: MainAxisSize.min,
+            children: [
+              leading,
+              const SizedBox(width: AppDesignTokens.space8),
+              effectiveChild,
+            ],
+          );
     final effectiveOnPressed = loading ? null : onPressed;
 
     return switch (variant) {
       AppLoadingButtonVariant.secondary => shad.SecondaryButton(
         onPressed: effectiveOnPressed,
-        leading: leading,
         alignment: alignment,
-        child: effectiveChild,
+        child: content,
       ),
       AppLoadingButtonVariant.primary => AppPrimaryButton(
         onPressed: effectiveOnPressed,
-        leading: leading,
         alignment: alignment,
-        child: effectiveChild,
+        child: content,
       ),
       AppLoadingButtonVariant.brand => shad.ButtonStyleOverride(
         decoration: (context, states, value) {
@@ -70,12 +78,7 @@ class AppLoadingButton extends StatelessWidget {
               ? palette.brandForeground.withValues(alpha: 0.55)
               : palette.brandForeground,
         ),
-        child: shad.SecondaryButton(
-          onPressed: effectiveOnPressed,
-          leading: leading,
-          alignment: alignment,
-          child: effectiveChild,
-        ),
+        child: shad.SecondaryButton(onPressed: effectiveOnPressed, alignment: alignment, child: content),
       ),
     };
   }

ui/flutter/lib/shared/widgets/app_primary_button.dart

@@ -31,6 +31,16 @@ class AppPrimaryButton extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     final palette = AppPalette.of(context);
+    final content = leading == null && trailing == null
+        ? child
+        : Row(
+            mainAxisSize: MainAxisSize.min,
+            children: [
+              if (leading != null) ...[leading!, const SizedBox(width: AppDesignTokens.space8)],
+              child,
+              if (trailing != null) ...[const SizedBox(width: AppDesignTokens.space8), trailing!],
+            ],
+          );
 
     return shad.ButtonStyleOverride(
       decoration: (context, states, value) {
@@ -48,14 +58,12 @@ class AppPrimaryButton extends StatelessWidget {
       },
       child: shad.PrimaryButton(
         onPressed: onPressed,
-        leading: leading,
-        trailing: trailing,
         alignment: alignment,
         size: size,
         density: density,
         shape: shape,
         disableTransition: disableTransition,
-        child: child,
+        child: content,
       ),
     );
   }