Filtering toast notifications

The families are Advancement, Recipe, Tutorial, System and Other (including now-playing music). Match non-exhaustively. For advancement toasts, the title is the task/goal/challenge label and the description is the advancement's name, not its advancement-screen description. Recipe notifications keep their rotating station/result icons; tutorial hints keep their progress bar. Edits change only the displayed text, not these identities or lifetimes. Setting the optional description to None removes that line.

The hook runs for new additions, not in-place addOrUpdate changes to an existing recipe or system toast. A cancelled tutorial hint is not retried every frame; a later, different hint is a new candidate. Title-screen backup/access failures, narrator notices, pack download/failure and chunk IO notices all use the same admission point. Client-lib prepares title candidates and Game admits them with a host before applying them; candidates produced during the initial resource loading screen wait until that handoff. The pause screen's persistent song label is HUD content, not a queued toast, and is not filtered by this hook.