When ir.config_parameter[fp.shopfloor.tablet_session_mode]='session_swap',
PIN submit calls /fp/tablet/unlock_session and reloads the page; the
new session manager service kicks in on next mount. handOff() calls
lockBack('manual') which destroys the tech session server-side and
re-auths as kiosk.
Legacy mode unchanged — same /fp/tablet/unlock + techStore flow.
The feature flag, kiosk_uid, and current_uid arrive via the existing
/fp/tablet/tiles bootstrap response (Task D0).
Adds a tablet_lock-owned Hand-Off button visible only in session_swap
mode (in legacy mode wrapper components own their own buttons that hit
techStore.lock(); session_swap renders our own button so the manual
hand-off goes through lockBack() + page reload).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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