Two small pieces of contract for modules that offer several tiles from live
data:
- A `tiles()` entry may say `single: true`: at most one such tile per
dashboard. The ＋ picker greys the entry out once it is placed ("Already on
this dashboard") and `addTile` refuses a second — for a control surface
that would only confuse in duplicate, a send box say.
- Admin config gains `multiselect`: several picks from one list, the same
`options` / `optionsRoute` as `select`, one switch per option, stored as an
array of values. A saved value the list no longer offers stays checked and
marked rather than being dropped in silence. The wrapper is a <label>, so
it is told to label nothing — otherwise a click anywhere would flip the
first switch.
Both documented in the module guide.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
