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/l10n/app_de.arb

@@ -108,6 +108,12 @@
   "themePluginNone": "Standard (kein Plugin)",
   "themePluginHint": "Installiertes studio.theme.*-Plugin auswählen, um das ganze Studio umzustylen. Erst eines aus dem Store installieren.",
   "themePluginEmpty": "Kein Theme-Plugin installiert. Im Store eines aus der Kategorie studio-plugin auswählen.",
+  "themePluginCustom": "Eigene Farbe",
+  "themePluginCustomDialogTitle": "Eigenes Theme — Seedfarbe wählen",
+  "themePluginCustomHexLabel": "Hex-Farbe",
+  "themePluginCustomPreview": "Live-Vorschau",
+  "themePluginCustomCancel": "Abbrechen",
+  "themePluginCustomApply": "Anwenden",
   "settingsTitle": "Hub-Endpunkt",
   "settingsHost": "Host",
   "settingsPort": "Port",

lib/l10n/app_en.arb

@@ -111,6 +111,12 @@
   "themePluginNone": "Built-in (no plugin)",
   "themePluginHint": "Pick an installed studio.theme.* plugin to re-skin the whole app. Install one from the Store first.",
   "themePluginEmpty": "No theme plugins installed. Open the Store and pick one in the studio-plugin category.",
+  "themePluginCustom": "Custom colour",
+  "themePluginCustomDialogTitle": "Custom theme — pick a seed colour",
+  "themePluginCustomHexLabel": "Hex colour",
+  "themePluginCustomPreview": "Live preview",
+  "themePluginCustomCancel": "Cancel",
+  "themePluginCustomApply": "Apply",
   "settingsTitle": "Hub endpoint",
   "settingsHost": "Host",
   "settingsPort": "Port",

lib/l10n/app_localizations.dart

@@ -662,6 +662,42 @@ abstract class AppLocalizations {
   /// **'No theme plugins installed. Open the Store and pick one in the studio-plugin category.'**
   String get themePluginEmpty;
 
+  /// No description provided for @themePluginCustom.
+  ///
+  /// In en, this message translates to:
+  /// **'Custom colour'**
+  String get themePluginCustom;
+
+  /// No description provided for @themePluginCustomDialogTitle.
+  ///
+  /// In en, this message translates to:
+  /// **'Custom theme — pick a seed colour'**
+  String get themePluginCustomDialogTitle;
+
+  /// No description provided for @themePluginCustomHexLabel.
+  ///
+  /// In en, this message translates to:
+  /// **'Hex colour'**
+  String get themePluginCustomHexLabel;
+
+  /// No description provided for @themePluginCustomPreview.
+  ///
+  /// In en, this message translates to:
+  /// **'Live preview'**
+  String get themePluginCustomPreview;
+
+  /// No description provided for @themePluginCustomCancel.
+  ///
+  /// In en, this message translates to:
+  /// **'Cancel'**
+  String get themePluginCustomCancel;
+
+  /// No description provided for @themePluginCustomApply.
+  ///
+  /// In en, this message translates to:
+  /// **'Apply'**
+  String get themePluginCustomApply;
+
   /// No description provided for @settingsTitle.
   ///
   /// In en, this message translates to:

lib/l10n/app_localizations_de.dart

@@ -326,6 +326,24 @@ class AppLocalizationsDe extends AppLocalizations {
   String get themePluginEmpty =>
       'Kein Theme-Plugin installiert. Im Store eines aus der Kategorie studio-plugin auswählen.';
 
+  @override
+  String get themePluginCustom => 'Eigene Farbe';
+
+  @override
+  String get themePluginCustomDialogTitle => 'Eigenes Theme — Seedfarbe wählen';
+
+  @override
+  String get themePluginCustomHexLabel => 'Hex-Farbe';
+
+  @override
+  String get themePluginCustomPreview => 'Live-Vorschau';
+
+  @override
+  String get themePluginCustomCancel => 'Abbrechen';
+
+  @override
+  String get themePluginCustomApply => 'Anwenden';
+
   @override
   String get settingsTitle => 'Hub-Endpunkt';
 

lib/l10n/app_localizations_en.dart

@@ -326,6 +326,25 @@ class AppLocalizationsEn extends AppLocalizations {
   String get themePluginEmpty =>
       'No theme plugins installed. Open the Store and pick one in the studio-plugin category.';
 
+  @override
+  String get themePluginCustom => 'Custom colour';
+
+  @override
+  String get themePluginCustomDialogTitle =>
+      'Custom theme — pick a seed colour';
+
+  @override
+  String get themePluginCustomHexLabel => 'Hex colour';
+
+  @override
+  String get themePluginCustomPreview => 'Live preview';
+
+  @override
+  String get themePluginCustomCancel => 'Cancel';
+
+  @override
+  String get themePluginCustomApply => 'Apply';
+
   @override
   String get settingsTitle => 'Hub endpoint';