today dashboard: activity_events, ListTodayView with events timeline, frontend TodayDashboard separated from sidebar

internal/core/nodes/repository.go

@@ -84,9 +84,22 @@ func (r *Repository) Create(parentID, typ, title, section string) (*Node, error)
 	if err != nil {
 		return nil, err
 	}
+	// Bump parent's updated_at so it appears in today view.
+	if parentID != "" {
+		_ = r.touch(parentID)
+	}
 	return n, nil
 }
 
+// touch updates a node's updated_at without changing other fields.
+func (r *Repository) touch(id string) error {
+	t := now()
+	_, err := r.db.Exec(
+		`UPDATE nodes SET updated_at=?, revision=revision+1
+		 WHERE id=? AND deleted_at IS NULL`, t, id)
+	return err
+}
+
 func (r *Repository) insertNode(n *Node) error {
 	var parent interface{}
 	if n.ParentID != nil {
@@ -180,24 +193,26 @@ func (r *Repository) ListRoots(includeDeleted bool, section string) ([]Node, err
 }
 
 // todayBoundaries returns RFC3339 start and end strings for the current day
-// in the local timezone (the server's timezone, which should match the user's).
-// TODO: accept a user timezone offset when multi-user support is added.
+// in UTC, so string comparison against UTC-stored DB timestamps is correct.
 func todayBoundaries() (string, string) {
 	now := time.Now()
 	y, m, d := now.Date()
 	start := time.Date(y, m, d, 0, 0, 0, 0, now.Location())
 	end := start.Add(24 * time.Hour)
-	return start.Format(time.RFC3339), end.Format(time.RFC3339)
+	return start.UTC().Format(time.RFC3339), end.UTC().Format(time.RFC3339)
 }
 
 // ListTodayNodes returns active root-level nodes created or updated today.
 // This is a dynamic view, not a section — it shows the day's activity.
+// Child nodes (notes, files, folders) are not listed directly; instead,
+// their parent is bumped via touch() on creation.
 func (r *Repository) ListTodayNodes() ([]Node, error) {
 	start, end := todayBoundaries()
 	q := `SELECT id,parent_id,type,title,slug,path,section,sort_order,
 		created_at,updated_at,deleted_at,revision,device_id
 		FROM nodes
 		WHERE deleted_at IS NULL
+		AND parent_id IS NULL
 		AND (
 			(created_at >= ? AND created_at < ?)
 			OR