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_module_sheet.dart

@@ -25,9 +25,7 @@ class FaiModuleSheet extends StatefulWidget {
       backgroundColor: Theme.of(context).colorScheme.surfaceContainer,
       isScrollControlled: true,
       shape: const RoundedRectangleBorder(
-        borderRadius: BorderRadius.vertical(
-          top: Radius.circular(FaiRadius.md),
-        ),
+        borderRadius: BorderRadius.vertical(top: Radius.circular(FaiRadius.md)),
       ),
       builder: (_) => FaiModuleSheet(moduleName: name),
     );
@@ -56,8 +54,7 @@ class _FaiModuleSheetState extends State<FaiModuleSheet> {
     // "remove the highest version", which is rarely what an
     // operator means when they've explicitly kept multiple
     // versions around.
-    final versions =
-        await HubService.instance.installedVersions(detail.name);
+    final versions = await HubService.instance.installedVersions(detail.name);
     if (!mounted) return;
     String? targetVersion;
     if (versions.length > 1) {
@@ -101,9 +98,7 @@ class _FaiModuleSheetState extends State<FaiModuleSheet> {
       );
       if (!mounted) return;
       ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(
-          content: Text(l.modulesUninstalledToast(r.name, r.version)),
-        ),
+        SnackBar(content: Text(l.modulesUninstalledToast(r.name, r.version))),
       );
       Navigator.pop(context, true);
     } catch (e) {
@@ -138,8 +133,9 @@ class _FaiModuleSheetState extends State<FaiModuleSheet> {
                 Padding(
                   padding: const EdgeInsets.all(FaiSpace.xl),
                   child: Text(
-                    AppLocalizations.of(context)!
-                        .moduleSheetFailedToLoad(snapshot.error.toString()),
+                    AppLocalizations.of(
+                      context,
+                    )!.moduleSheetFailedToLoad(snapshot.error.toString()),
                     style: theme.textTheme.bodyMedium?.copyWith(
                       color: theme.colorScheme.error,
                     ),