Toast: replace buried #admin-msg hint with a floating green/red toast
(bottom-right, auto-dismisses after 3s) covering every save action —
lists, decks, items, grades, kids, units, courses, bulk imports, and
planner saves.
Planner batch add: clicking '+ Add' now queues items locally (shown
as dashed pending badges) without saving. A '💾 Save N items' button
appears in the toolbar; clicking it commits everything at once and
refreshes the planner. Queue clears on student change.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
nmemmertandClaude Sonnet 4.6
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