fix(ui): disabled primary is a grey chip, tx badge, MCP button sizes, ERD toolbar, switch row inset

- A disabled filled button uses the muted surface and label instead of a
  half-transparent accent.
- The SQL toolbar badge reads Auto-commit / Manual commit before the first
  run instead of 'Transaction —'.
- MCP section buttons are md like the rest of Preferences.
- Switch rows no longer inset their label by 4 px.
- Below 1100 px the ERD toolbar's Note, Auto layout and hidden-tables
  buttons are icon-only, so Export does not wrap alone.

Refs #1480

Author: ZhuchkaTriplesix

lib/features/erd/erd_view.dart

@@ -1598,7 +1598,13 @@ class _ErdViewState extends material.State<ErdView>
         material.Container(
           decoration: SqlEditorChrome.sqlToolbarDecoration(context),
           padding: const material.EdgeInsets.all(8),
-          child: QueryaControlScope(
+          child: material.LayoutBuilder(
+            builder: (context, constraints) {
+              // Below ~1100 px the labels of Note, Auto layout and the hidden
+              // tables button give way to icons (the tooltips keep the names)
+              // so the toolbar stays on one row.
+              final compact = constraints.maxWidth < 1100;
+              return QueryaControlScope(
             size: QueryaControlSize.md,
             child: material.Wrap(
             spacing: 8,
@@ -1641,6 +1647,7 @@ class _ErdViewState extends material.State<ErdView>
                 _viewsMenu(),
               QueryaButton.secondary(
                 key: const material.ValueKey('erd_add_note'),
+                compact: compact,
                 label: 'Note',
                 icon: material.Icons.sticky_note_2_outlined,
                 tooltip: 'Add a sticky note to the diagram',
@@ -1649,6 +1656,7 @@ class _ErdViewState extends material.State<ErdView>
               if (_marked.isNotEmpty)
                 QueryaButton.secondary(
                   key: const material.ValueKey('erd_group_marked'),
+                compact: compact,
                   label: 'Group ${_marked.length} '
                       '${_marked.length == 1 ? 'table' : 'tables'}',
                   icon: material.Icons.folder_open_rounded,
@@ -1658,12 +1666,14 @@ class _ErdViewState extends material.State<ErdView>
               if (_hidden.isNotEmpty)
                 QueryaButton.secondary(
                   key: const material.ValueKey('erd_show_all'),
+                compact: compact,
                   label: 'Show ${_hidden.length} hidden',
                   icon: material.Icons.visibility_outlined,
                   onPressed: _showAllTables,
                 ),
               QueryaButton.secondary(
                 key: const material.ValueKey('erd_auto_layout'),
+                compact: compact,
                 label: 'Auto layout',
                 icon: material.Icons.auto_fix_high_rounded,
                 tooltip: 'Arrange the tables again (undoes manual moves)',
@@ -1684,6 +1694,8 @@ class _ErdViewState extends material.State<ErdView>
               ),
             ],
             ),
+              );
+            },
           ),
         ),
         material.Expanded(child: material.ClipRect(child: body)),

lib/features/settings/preferences_controls.dart

@@ -129,7 +129,7 @@ class PreferencesSwitchRow extends StatelessWidget {
         onTap: isInteractive ? () => onChanged!(!value) : null,
         borderRadius: material.BorderRadius.circular(6),
         child: material.Padding(
-          padding: const material.EdgeInsets.symmetric(vertical: 6, horizontal: 4),
+          padding: const material.EdgeInsets.symmetric(vertical: 6),
           child: material.Row(
             crossAxisAlignment: material.CrossAxisAlignment.center,
             children: [

lib/features/settings/preferences_mcp_section.dart

@@ -257,14 +257,14 @@ class PreferencesMcpSectionState
                 key: material.ValueKey('mcp_copy_${kind.name}'),
                 label: 'Copy ${kind.label} config',
                 icon: material.Icons.copy_rounded,
-                size: QueryaControlSize.sm,
+                size: QueryaControlSize.md,
                 onPressed: () => unawaited(_copy(kind)),
               ),
             QueryaButton.secondary(
               key: const material.ValueKey('mcp_regenerate'),
               label: 'Regenerate token',
               icon: material.Icons.key_rounded,
-              size: QueryaControlSize.sm,
+              size: QueryaControlSize.md,
               tooltip: 'Disconnects connected clients; they reconnect on '
                   'their next start.',
               onPressed: _enabled && !_busy ? () => unawaited(_regenerate()) : null,
@@ -286,7 +286,7 @@ class PreferencesMcpSectionState
             QueryaButton.secondary(
               key: const material.ValueKey('mcp_clear_log'),
               label: 'Clear',
-              size: QueryaControlSize.sm,
+              size: QueryaControlSize.md,
               onPressed: _activity.isEmpty ? null : () => unawaited(_clearLog()),
             ),
           ],

lib/features/workspace/sql_workspace_toolbar.dart

@@ -127,13 +127,9 @@ class SqlWorkspaceToolbar extends StatelessWidget {
 
   material.Widget _txBadge() {
     final open = txOpen;
-    if (open == null) {
-      return const QueryaBadge.status(
-        'Transaction —',
-        status: QueryaBadgeStatus.neutral,
-      );
-    }
-    if (open) {
+    // An unknown state (before the first run) reads as the commit mode, not
+    // as a dash.
+    if (open == true) {
       return const QueryaBadge.status(
         'Transaction open',
         status: QueryaBadgeStatus.warning,

lib/shared/widgets/querya_button.dart

@@ -318,14 +318,21 @@ class _QueryaButtonState extends material.State<QueryaButton> {
       final base = w.variant == QueryaButtonVariant.primary
           ? wb.accent
           : wb.destructive;
-      foreground = w.variant == QueryaButtonVariant.primary
-          ? wb.onAccent
-          : _onColor(base);
-      final tint = _pressed && enabled
-          ? 0.22
-          : (_hovered && enabled ? 0.12 : 0.0);
-      background =
-          material.Color.alphaBlend(foreground.withValues(alpha: tint), base);
+      if (w.onPressed == null) {
+        // A disabled filled button is a quiet grey chip, not a faded accent:
+        // the label of a half-transparent teal button was hard to read.
+        foreground = scheme.mutedForeground;
+        background = scheme.muted;
+      } else {
+        foreground = w.variant == QueryaButtonVariant.primary
+            ? wb.onAccent
+            : _onColor(base);
+        final tint = _pressed && enabled
+            ? 0.22
+            : (_hovered && enabled ? 0.12 : 0.0);
+        background =
+            material.Color.alphaBlend(foreground.withValues(alpha: tint), base);
+      }
     } else {
       final toneColor = w.tone == QueryaButtonTone.destructive
           ? wb.destructive
@@ -467,7 +474,7 @@ class _QueryaButtonState extends material.State<QueryaButton> {
       ),
     );
 
-    if (w.onPressed == null) {
+    if (w.onPressed == null && !filled) {
       button = material.Opacity(opacity: 0.5, child: button);
     }
 

test/shared/widgets/querya_button_test.dart

@@ -38,6 +38,32 @@ void main() {
       expect(taps, 0);
     });
 
+    testWidgets('a disabled primary is a grey chip, not a faded accent',
+        (tester) async {
+      await tester.pumpWidget(
+        _shell(const QueryaButton.primary(label: 'Save')),
+      );
+      expect(
+        find.descendant(
+          of: find.byType(QueryaButton),
+          matching: find.byType(material.Opacity),
+        ),
+        findsNothing,
+      );
+
+      // Other disabled variants still fade.
+      await tester.pumpWidget(
+        _shell(const QueryaButton.secondary(label: 'Save')),
+      );
+      expect(
+        find.descendant(
+          of: find.byType(QueryaButton),
+          matching: find.byType(material.Opacity),
+        ),
+        findsOneWidget,
+      );
+    });
+
     testWidgets('a loading button does not fire', (tester) async {
       var taps = 0;
       await tester.pumpWidget(