Feed filters and the default-saved-view mirror lived under shared localStorage keys, so one
account's view (incl. its starred default) leaked into another account signed into the same
browser — visible with per-tab accounts as a fresh account showing the previous account's
'N active' filters instead of a clean default.
Key both by the tab's active account (siftlode.filters.<id> / siftlode.defaultViewFilters.<id>);
load a tab's filters from its own account on login/switch/add, falling back to defaults when the
account isn't known yet. A share link's filters still win and are persisted to the account. The
old shared keys are simply no longer read (a one-time reset to defaults on the first load after
this change; migrating them would risk re-leaking across accounts).
A new "Saved views" filter-sidebar widget (SavedViewsWidget): save the
current filters under a name, apply one with a click (active-highlighted
when it matches), rename, delete (confirm), drag-reorder, share by link
(reuses shareUrl), and star one as the default. The default view's filters
are mirrored to localStorage so loadInitialFilters applies it synchronously
on load/F5 (an api/url share link still wins; no default → last-session
filters as before). Hidden for the demo account. EN/HU/DE.
