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>
