Feature: allow redoing / editing a finished "Your review" session for a day

[LJXXXD]

Problem

There’s no way to re-run or edit a finished “Your review” session for a day. During review you can go back one card (UI only) but once you complete the last card there’s no UI to reopen the reviewed cards or edit/delete the saved review ratings. I accidentally marked an entire day as “Distracted” and cannot correct it.

Expected behavior

• A way to reopen or redo the review for a specific day (e.g. “Redo review for YYYY-MM-DD” or “Edit past reviews”).
• Editing should update the persisted ratings (timeline_review_ratings) so the day/week summary and coverage are corrected.

Suggested implementation ideas (optional)

• Add a “Redo review” / “Edit reviews” action on the Day/Timeline summary that opens the review overlay with previously-reviewed cards and allows changing ratings (commits should update DB rows).
• Add a per-day “clear review ratings” action that deletes timeline_review_ratings for the day so users can re-run review from scratch.

Why this matters

Users make mistakes during quick swipes or keyboard shortcuts. The current undo only steps the overlay back during an active session but does not provide a way to correct a fully-completed day, resulting in incorrect summaries and metrics.

Steps to reproduce

1. Open the Timeline review for a past day with multiple cards.
2. Rapidly mark cards (e.g. accidentally mark all as Distracted).
3. Finish the review — there is no UI to reopen or edit those ratings for that day.

Environment

• Repo: JerryZLiu/Dayflow
• Storage: local DB table timeline_review_ratings