Native notifications (approval / sudo / secret / clarify) are tagged with
the gateway *runtime* session id — the key under which the session lives in
the gateway's in-memory `_sessions` map and the id every event carries
(`tui_gateway/server.py` `_emit(event, sid, ...)`). The chat route, however,
is keyed by the *stored* session id (`stored_session_id`), which is a
different value: a new chat gets its runtime id immediately but its stored id
only once the first turn persists.
`onFocusSession` navigated straight to `sessionRoute(<runtime id>)`, so
clicking a notification (e.g. an approval prompt) sent the route-resume path a
runtime id where it expects a stored id. `useRouteResume` then resumed it as a
stored session -> REST `/api/sessions/<runtime id>` 404 "session not found",
and the running session was navigated away, which the user experiences as the
session being destroyed.
Translate runtime -> stored before navigating via the existing
`runtimeIdByStoredSessionId` map (new `storedSessionIdForNotification`
helper), falling back to the id as-is when no mapping is known. The
Approve/Reject notification button path is untouched: `approval.respond` is
routed by the runtime id (`_sess()` -> `_sessions[session_id]`), so it must
keep carrying the runtime id.
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