#88 — thickness band is now display-only, derived deterministically from
thickness_in against the synced Woo thickness terms (TV-9 / QUALITY-95).
Replaces the <select> with a read-only div. New pure function
deriveThicknessTermId + 6 unit tests. Docs (UAT-PRACTICE, contracts/UX)
updated to reflect the band is not an owner control.
#90 — MultiSelect closed state now shows the selected option names
(truncated to 2 + +N) instead of just a count. onCommit prop wired so
multi-select changes persist + re-review immediately (250ms debounce,
flush on Done, cleanup on destroy). Single-select binds use string vars
(speciesSel/edgeSel/gradeSel) to fix the number/string mismatch with
<option value={id}>; a tick()-deferred syncSelects() keeps the DOM
option in sync after programmatic writes (AI prefill, reload hydrate)
that Svelte's own select_option would otherwise reset.
