* feat: add package amount persistence and backend route support
* test: align backend test schemas with medication metadata fields
* fix(backend): restore intake usage normalizer for planner endpoint
* fix(backend): keep export typing compatible before liquid-unit stack step
* feat: simplify tube stock editing in desktop and mobile forms
* feat: improve mobile edit modal swipe gestures and tab navigation
Replace React passive touch handlers with native non-passive
addEventListener via useEffect for reliable horizontal swipe blocking.
Reduce axis-lock threshold from 18-26px to 6px for more responsive
gesture detection. Remove isInteractive() guard so swipe works on
input fields. Add tab strip auto-scroll via scrollIntoView when
active tab changes. Fix vertical scrolling by changing readonly
fieldset from display:block to display:flex.
Closes#252
* fix: guard scrollIntoView for jsdom test compatibility
Daniel Volz