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_status_dot.dart

@@ -88,14 +88,8 @@ class _FaiStatusDotState extends State<FaiStatusDot>
 /// Convenience presets.
 class FaiStatusDots {
   FaiStatusDots._();
-  static Widget live() => const FaiStatusDot(
-        color: FaiColors.success,
-        pulsing: true,
-      );
-  static Widget idle() => const FaiStatusDot(
-        color: FaiColors.muted,
-      );
-  static Widget down() => const FaiStatusDot(
-        color: FaiColors.danger,
-      );
+  static Widget live() =>
+      const FaiStatusDot(color: FaiColors.success, pulsing: true);
+  static Widget idle() => const FaiStatusDot(color: FaiColors.muted);
+  static Widget down() => const FaiStatusDot(color: FaiColors.danger);
 }