feat(studio): rich theme picker (presets + custom colour) + editor 0.11.0

Settings dialog's Theme Plugin section is now a grid of
swatched tiles:

- Built-in (none) — falls back to FaiTheme.light/.dark
- One tile per installed studio.theme.* plugin, each
  showing the plugin's primary/secondary/tertiary as
  live colour dots. Tile loads its preview lazily so a
  dozen installed themes don't block the picker.
- Custom — opens a colour-picker dialog with 12 curated
  Material presets + a hex input + live preview. Selecting
  applies ColorScheme.fromSeed for both brightnesses.

main.dart's _pluginThemes parses a 'custom:#RRGGBB' sigil
in the same notifier slot as plugin capability ids, so the
existing persistence + restoration paths cover the custom
case with no new state.

Bumps editor to 0.11.0 (type-checked port connections +
dynamic card width fix + card-height border allowance) and
Studio to 0.58.0.

Signed-off-by: flemming-it <stefan.a.flemming@googlemail.com>

lib/widgets/fai_pill.dart

@@ -6,13 +6,7 @@ import 'package:flutter/material.dart';
 import '../theme/theme.dart';
 import '../theme/tokens.dart';
 
-enum FaiPillTone {
-  neutral,
-  accent,
-  success,
-  warning,
-  danger,
-}
+enum FaiPillTone { neutral, accent, success, warning, danger }
 
 class FaiPill extends StatelessWidget {
   final String label;
@@ -36,10 +30,7 @@ class FaiPill extends StatelessWidget {
         ? FaiTheme.mono(size: 11, weight: FontWeight.w500, color: fg)
         : theme.textTheme.labelSmall?.copyWith(color: fg);
     return Container(
-      padding: const EdgeInsets.symmetric(
-        horizontal: FaiSpace.sm,
-        vertical: 3,
-      ),
+      padding: const EdgeInsets.symmetric(horizontal: FaiSpace.sm, vertical: 3),
       decoration: BoxDecoration(
         color: bg,
         borderRadius: BorderRadius.circular(FaiRadius.sm),
@@ -62,10 +53,7 @@ class FaiPill extends StatelessWidget {
       case FaiPillTone.neutral:
         return (scheme.surfaceContainerHighest, scheme.onSurfaceVariant);
       case FaiPillTone.accent:
-        return (
-          scheme.primary.withValues(alpha: 0.15),
-          scheme.primary,
-        );
+        return (scheme.primary.withValues(alpha: 0.15), scheme.primary);
       case FaiPillTone.success:
         return (
           FaiColors.success.withValues(alpha: 0.15),
@@ -81,10 +69,7 @@ class FaiPill extends StatelessWidget {
               : const Color(0xFFB45309),
         );
       case FaiPillTone.danger:
-        return (
-          scheme.errorContainer,
-          scheme.onErrorContainer,
-        );
+        return (scheme.errorContainer, scheme.onErrorContainer);
     }
   }
 }