menu_app now tracks the last key-activity timestamp (via current_sec,
same wraparound-safe pattern already used in pair_app) and switches
back to home_app if no key event arrives for 10 seconds, using the
AppManager's existing per-frame onRun() callback as the check point.
Splits the ad-hoc menu_level state machine into standalone Apps with a
uniform parent/child exit convention (long-press CONFIRM -> parent):
clock_app renamed to home_app (boot-default), new set_clock_app
extracted from home_app's time-edit mode, new ipc_bind_app extracted
from menu_app's old level-2 screen, and the sensor-type selection step
merged into pair_app as its new initial state. menu_app now only holds
the 4-item top-level list (language toggle inline). Also makes both
menu_app and pair_app's up/down navigation cyclic (wraps at both ends).
