Seven session entry types — title_change, credential_pin, mode_change,
service_tier_change, ttsr_injection, reset_boundary and session_init —
fell through #getEntryDisplayText's default branch to the empty string,
and none of them were in the default view's hidden set. Each one drew as
a bare bullet: a row you cannot read, cannot identify and cannot explain
the gap it leaves in the thread.
Hide them in the default and no-tools views, alongside the settings
entries they resemble, and give every one of them a label for `all`
mode. The default branch now falls back to the entry type rather than
the empty string, so a type added later degrades to a dull row instead
of an invisible one. Service tier renders its per-family map, and says
"(default)" when the tier was cleared instead of printing null.
can1357