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/today_story_loader.dart

@@ -58,7 +58,8 @@ class TodayStoryLoader {
   /// Resolves to `~/.fai/today/active.yaml` on every supported
   /// host. The pipeline writes here from [tools/today/accept.sh].
   static String activePath() {
-    final home = Platform.environment['HOME'] ??
+    final home =
+        Platform.environment['HOME'] ??
         Platform.environment['USERPROFILE'] ??
         '';
     return p.join(home, '.fai', 'today', 'active.yaml');
@@ -89,8 +90,8 @@ class TodayStoryLoader {
 
     String s(String key) => (doc[key] ?? '').toString().trim();
     if (_bannedWords.hasMatch(
-          '${s('title_en')} ${s('title_de')} ${s('body_en')} ${s('body_de')}',
-        )) {
+      '${s('title_en')} ${s('title_de')} ${s('body_en')} ${s('body_de')}',
+    )) {
       return null;
     }