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>

halkyon_learn_client/lib/src/protocol/review/review_log.dart

@@ -95,6 +95,8 @@ abstract class ReviewLog
   /// (back to front, with a schedule of its own, as Anki's reverse cards have),
   /// or 'cram' (outside the schedule: counts for streaks and the activity
   /// heatmap, never moves a schedule). Reviews from before modes are 'review'.
+  /// 'reset' is no rating but a fresh start: the card's schedules replay only
+  /// what follows it, its rating means nothing.
   String mode;
 
   @override
@@ -313,6 +315,8 @@ class ReviewLogTable extends _isd.Table<_isc.UuidValue?> {
   /// (back to front, with a schedule of its own, as Anki's reverse cards have),
   /// or 'cram' (outside the schedule: counts for streaks and the activity
   /// heatmap, never moves a schedule). Reviews from before modes are 'review'.
+  /// 'reset' is no rating but a fresh start: the card's schedules replay only
+  /// what follows it, its rating means nothing.
   late final _isd.ColumnString mode;
 
   _i4926i81.CardTable get card {