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.

drizzle/0022_multiple_reminders.sql

@@ -0,0 +1,7 @@
+DROP INDEX IF EXISTS "reminders_entity_unique";
+--> statement-breakpoint
+ALTER TABLE "reminders" ADD COLUMN "offset_minutes" integer;
+--> statement-breakpoint
+CREATE INDEX "reminders_entity_idx" ON "reminders" USING btree ("entity_type","entity_id");
+--> statement-breakpoint
+ALTER TABLE "users" ADD COLUMN "default_event_reminder_offsets" jsonb DEFAULT '[30]'::jsonb NOT NULL;