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).
App/isr_jump.asm was never added to wristband.uvproj, so the Port0/Port2/Port3
hardware vector redirects it defines were never assembled. Port3_Isr (declared
as interrupt 16) never actually ran on real P3 port events, causing the
edge-interrupt-driven RF decode to silently never fire. Adds the missing
CSEG/LJMP redirect for vector 40 and registers the file as FileType=2.
