- Dashboard bulk toolbar: select batteries, pick a device, click 'Install
in device'; confirms before moving already-installed batteries; enforces
slot capacity and warns on brand mix
- Battery detail: 'Unretire Battery' button replaces 'Retire Battery' when
battery is retired, restoring it to available status
- Tests: 3 new bulk-install-device tests (capacity block, move, success);
42 total passing
New nullable columns on Battery: size, chemistry, capacity_mah,
tested_capacity_mah, tested_date, charge_cycles, purchase_date.
Battery detail page shows all populated fields and a full edit form
with select dropdowns for size and chemistry (with Other fallback).
Capacity health % shown in green/orange/red when both nominal and
tested capacity are set. Dashboard gains a Size column.
iterminate