timer-run: use system sound instead of generated PCM beep

Replace the Python sine-wave generator and raw PCM piping with
paplay playing alarm-clock-elapsed.oga, falling back to
canberra-gtk-play. Also export PULSE_RUNTIME_PATH for the detached
setsid process so paplay can find the PipeWire-Pulse socket.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

desktopenvs/hyprland/scripts/timer-run

@@ -8,14 +8,14 @@
 TOTAL="${1:?missing seconds}"
 LABEL="${2:-}"
 
-# ── source the user environment if running without a login shell ───────────────
-# When launched from Hyprland keybind → kitty → exec, the process inherits
-# kitty's env which already has DBUS_SESSION_BUS_ADDRESS, XDG_RUNTIME_DIR etc.
-# But after setsid detach those are preserved since we don't re-login.
-# We do need to make sure XDG_RUNTIME_DIR is set for pipewire/pulse socket paths.
+# ── ensure runtime dir env vars are set for audio/dbus in detached context ────
 if [[ -z "${XDG_RUNTIME_DIR:-}" ]]; then
   export XDG_RUNTIME_DIR="/run/user/$(id -u)"
 fi
+# paplay resolves the PulseAudio/PipeWire socket via PULSE_RUNTIME_PATH
+if [[ -z "${PULSE_RUNTIME_PATH:-}" ]]; then
+  export PULSE_RUNTIME_PATH="${XDG_RUNTIME_DIR}/pulse"
+fi
 
 # ── detach from terminal immediately ──────────────────────────────────────────
 # Preserve the full environment across the setsid re-exec (no login shell).
@@ -70,41 +70,10 @@ if command -v notify-send &>/dev/null; then
 fi
 
 # ── audio alert ───────────────────────────────────────────────────────────────
-# pw-play / paplay need PIPEWIRE_RUNTIME_DIR or PULSE_RUNTIME_PATH which live
-# under XDG_RUNTIME_DIR — already ensured above.
+_ALARM_SOUND="/usr/share/sounds/freedesktop/stereo/alarm-clock-elapsed.oga"
 
-_beep_pcm() {
-python3 - <<'PYEOF'
-import struct, math, sys
-
-RATE  = 44100
-FREQ  = 880.0
-VOL   = 0.65
-BEEPS = 3
-DUR   = 0.55
-GAP   = 0.18
-
-def sine(freq, secs):
-    n = int(RATE * secs)
-    return [int(VOL * 32767 * math.sin(2 * math.pi * freq * i / RATE)) for i in range(n)]
-
-def silence(secs):
-    return [0] * int(RATE * secs)
-
-samples = []
-for i in range(BEEPS):
-    samples += sine(FREQ, DUR)
-    if i < BEEPS - 1:
-        samples += silence(GAP)
-
-sys.stdout.buffer.write(struct.pack(f'<{len(samples)}h', *samples))
-PYEOF
-}
-
-if command -v pw-play &>/dev/null; then
-  _beep_pcm | pw-play --rate=44100 --channels=1 --format=s16 - 2>/dev/null
-elif command -v paplay &>/dev/null; then
-  _beep_pcm | paplay --raw --rate=44100 --channels=1 --format=s16le - 2>/dev/null
-elif command -v aplay &>/dev/null; then
-  _beep_pcm | aplay -q -r 44100 -c 1 -f S16_LE - 2>/dev/null
+if command -v paplay &>/dev/null && [[ -f "$_ALARM_SOUND" ]]; then
+  paplay "$_ALARM_SOUND" 2>/dev/null
+elif command -v canberra-gtk-play &>/dev/null; then
+  canberra-gtk-play --id=alarm-clock-elapsed 2>/dev/null
 fi