feat: add browse-at-scale — date ranges, load more, month navigator

CLI: --month YYYY-MM, --from/--to date range, --limit override
API: from/to query params for date range filtering
Web: load more button for pagination, month nav (◂/▸) in stream view

internal/db/entities.go

@@ -64,6 +64,8 @@ type Entity struct {
 type ListParams struct {
 	Tag            *string
 	Date           *string
+	From           *string
+	To             *string
 	Since          *time.Time
 	CardsOnly      bool
 	IncludeDeleted bool
@@ -192,6 +194,14 @@ func (s *Store) List(params ListParams) ([]*Entity, error) {
 		where = append(where, "date(e.created_at) = ?")
 		args = append(args, *params.Date)
 	}
+	if params.From != nil {
+		where = append(where, "date(e.created_at) >= ?")
+		args = append(args, *params.From)
+	}
+	if params.To != nil {
+		where = append(where, "date(e.created_at) <= ?")
+		args = append(args, *params.To)
+	}
 	if params.Since != nil {
 		where = append(where, "e.created_at >= ?")
 		args = append(args, params.Since.Format(time.RFC3339))