Heartbeat now emits only a tmux fg color that interpolates
teal to gray based on activity score. Status-right supplies
the time display directly. Removes bar/pill/time rendering.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Add heartbeat.sh that tracks session active time using three native
tmux signals: client input (+5), window output (+2), and copy mode
(+2), with -1 decay per tick. Score drives a block bar indicator
and accumulated active time counter. Resets on tmux server restart.
Status bar updates:
- Heartbeat pill with pressure bar right of clock
- Responsive breakpoints: hide network/battery <120 cols, date <80
- Click clock/date to toggle condensed view
- Click heartbeat to instant-lock session
- Static colon in clock (replaces shell-based blinker)
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
