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/data/theme_plugin.dart

@@ -39,8 +39,9 @@ class ThemePluginSchemes {
 Future<List<String>> listThemePluginCapabilities() async {
   final caps = await HubService.instance.allCapabilities();
   return caps
-      .where((c) =>
-          c.kind == 'wasm' && c.capability.startsWith('studio.theme.'))
+      .where(
+        (c) => c.kind == 'wasm' && c.capability.startsWith('studio.theme.'),
+      )
       .map((c) => c.capability)
       .toList()
     ..sort();
@@ -121,6 +122,7 @@ ColorScheme _tokensToColorScheme(List<int> tokens, Brightness brightness) {
         ? const Color(0xFF1A1A1A)
         : const Color(0xFFEEEEEE);
   }
+
   return ColorScheme(
     brightness: brightness,
     primary: slot(0),