feat(app): reviews know how a card was studied; progress can start afresh

Each review records its mode (ADR 0004, rule 3): front to back, back to
front with a schedule of its own, or crammed outside the schedule. A
card's schedule replays only the reviews of one mode. Resetting progress
appends a 'reset' entry per card, no migration (the column is text):
schedules replay what follows it, and the history stays for the streak
and the heatmap. Reviews are inserted in batches.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Tizian 「ティツィアーン」 <raisondetredev@pm.me>

docs/adr/0004-tree-tags-review-modes-settings-assets.md

@@ -56,7 +56,9 @@ revision's payload, and the per-side merge of ADR 0003 becomes per field.
    back), `reverse` (back to front, with a schedule of its own, as Anki's reverse cards
    have) or `cram` (outside the schedule: it counts for streaks and the activity
    heatmap, and never moves a schedule). A card's schedule replays only the reviews of
-   one mode. Existing reviews are `review`.
+   one mode. Existing reviews are `review`. Resetting a card's progress (added
+   2026-10-01) appends a `reset` entry rather than deleting reviews: schedules replay
+   only what follows it, and the streak and the heatmap keep the history.
 4. **A person's settings are one synced row.** `person_settings` holds settings in a
    versioned payload: study goals now, other preferences later. Two devices creating it
    while offline make two rows; the app keeps the one with the smallest id and folds the