When you start an exercise, the Mini App now fetches the most
recent time you logged it and shows a hint line in the sets card
("Last time: 8×60, 6×60, 5×60 · 3 days ago"), plus pre-fills the
weight input with the last set's weight.
- db.get_last_exercise(user_id, name): most recent non-deleted
entry, case-insensitive name match, sets_detail parsed.
- GET /api/exercises/last?name=<name>.
- webapp: loadLastSession() on startExercise + draft restore;
hint cleared on editExercise (the set rows are the reference
there). Pre-fill only when the weight field is empty and no
sets logged yet, so it never clobbers user input.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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