The /views/{slug} runner now mounts the same FilterBar primitive that
/events and /inbox use. The saved view's filter_spec becomes the bar's
baseline, axes are picked client-side per the view's data sources so a
deadline-only view exposes deadline_status, an approval-driven view
exposes approval_viewer_role + approval_status + approval_entity_type,
etc. Universal axes (time, personal_only, sort) always render.
Per-session tweaks overlay the saved baseline without mutating the
stored row; the URL round-trips state through the bar's existing codec
so deep-links share the active narrow. "Speichern als Sicht" stays
available on user-owned views so a tweaked narrow can be forked into a
new saved view.
Shape axis is intentionally excluded from the bar — the existing
top-of-page shape chip cluster (list / cards / calendar / timeline)
already plays that role and switching now mutates the cached render
spec without re-hitting the substrate.
Empty-state hint reuses the saved filter summary as before; the bar's
onResult handler hides all shape hosts when the rows array is empty.