feat(app): the home dashboard's data: activity, streak, goal, layout

What the dashboard shows, worked out from this device's data: cards
rated (crammed included, fresh starts not) and cards written per local
day; the streak, up to today or yesterday, rest days counting; the cards
falling due per day, but those resting in archived studysets; the study
goal's progress in its day or week. The goal, the rest days and the
dashboard's arrangement live in the synced settings (payload schema 3).
Cards tell when they were made by their UUID v7 ids; reviews report
their changes.

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_flutter/test/sync/support/sync_devices.dart

@@ -189,6 +189,7 @@ final class SyncDevice(
     await studysets.dispose();
     await tags.dispose();
     await settings.dispose();
+    await reviews.dispose();
     await cards.dispose();
     await _syncRequests.dispose();
     await _db.close();