The HUD's notes list filtered journal/note entries by `created_at >= started_at`
with no upper bound, so a *closed* session kept absorbing every note she wrote
afterward — a session from last Saturday would show a note jotted 25 minutes ago.
Cap the window at `ended_at` for closed sessions; live sessions (no end yet) stay
open-ended as before.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>