- Fix layout shift on edit_mode toggle: always render the edit button
(using invisible/pointer-events-none) so the flex container doesn't
reflow when edit_mode is toggled on/off.
- Fix 'store.set is not a function' crash: remove $bindable() from
current_value. The component is SWR-first; after a successful PATCH
liveQuery updates the prop from Dexie. Trying to write back to a
readonly liveQuery-derived prop caused the crash.
- Fix stale display after save: add has_optimistic flag + display_value
derived. After a successful PATCH, display_value shows draft_value
immediately without waiting for liveQuery. Cleared automatically when
current_value catches up, or on cancel/re-open of edit mode.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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