feat: p2 batch 28-31 reminders lists comments bang stats

Calendar events support multiple reminder offsets with presets and per-user defaults.

Lists index adds inline task entry and list property editing.

Generic entity comments on list detail. New bangs.stats dashboard widget.

Closes Gitea #28, #29, #30, #31. Migrations 0022 and 0023.

docs/tasks/92-bang-stats-widget.md

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+# 92 — Bang stats dashboard widget
+
+## Goal
+
+A second bangs dashboard widget showing monthly/yearly counts and average days between bangs.
+
+## What we decided
+
+- Widget id `bangs.stats`, separate from `bangs.counter`.
+- Aggregates computed server-side from `bang_events.occurred_on`.
+- Works alongside edit/delete from task 83.
+
+## Depends on
+
+- Bangs module, 83 (edit/delete)
+
+## Scope
+
+- `getBangAggregates` query.
+- `BangStatsWidget` component.
+- Manifest registration.
+
+## Acceptance criteria
+
+- [x] Widget registered and placeable on dashboards
+- [x] Shows monthly and yearly counts
+- [x] Shows average days between bangs
+
+## Notes
+
+- Gitea: [ginnoir/famapp#31](https://gitea.ginnoir.com/ginnoir/famapp/issues/31)