Alert on tmux output while its terminal is unfocused

tmux only raises an activity flag for windows that are not currently
selected, so a long-running command in the window you left selected --
the common case, since you switch away by moving your Hyprland focus
elsewhere rather than by selecting another tmux window -- finished
silently and the indicator never lit.

Windows now also count as waiting when they are selected in an attached
client, every client showing them is unfocused, and their window_activity
is newer than an @omarchy_unfocused_activity watermark. The watermark is
stamped by a new `track` subcommand wired to client-focus-in/out and the
existing select-window hooks, so it records where attention last was.
The hooks pass #{window_id} and #{window_activity} as arguments, which
tmux expands when the hook fires; run-shell -b would otherwise let output
arriving during the handoff be swallowed by the new watermark. The focus
hooks take index 100 to leave a user's own bindings alone.

That state has no hook of its own, so it needs polling to be noticed.
The probe therefore moves out of the indicator and into a service plugin,
alongside nightlight and battery. A bar surface exists per monitor and
each one instantiates every indicator twice, once per block, so a timer
on the indicator meant a shell-out per instance per tick -- four probe
processes every three seconds on a two-monitor machine, forever. One
service polls for the whole shell instead.

Sharing the state also fixes what per-instance polling would have papered
over: each indicator used to own its own count, so a timer-driven update
only refreshed the bar it ran on and left the other monitors stale.
Refreshes still arrive over the existing indicator broadcast, which now
coalesces into a single run no matter how many bars relay it.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018CC9kSQv8ZEogaxDoeKBzL

shell/plugins/services/tmux/TmuxModel.js

@@ -0,0 +1,29 @@
+// Shape of `omarchy-tmux-alert show --json`. The command emits one JSON object
+// on the last line; anything tmux or a shell profile printed before it is
+// ignored so a noisy environment cannot blank the indicator.
+function waitingFromOutput(output) {
+  var text = String(output === undefined || output === null ? "" : output).trim()
+  if (!text) return { count: 0, tooltip: "" }
+
+  var lines = text.split("\n")
+  var data
+  try {
+    data = JSON.parse(lines[lines.length - 1])
+  } catch (e) {
+    return { count: 0, tooltip: "" }
+  }
+
+  if (!data || typeof data !== "object") return { count: 0, tooltip: "" }
+
+  var count = Number(data.count)
+  return {
+    count: isFinite(count) && count > 0 ? Math.floor(count) : 0,
+    tooltip: data.tooltip === undefined || data.tooltip === null ? "" : String(data.tooltip)
+  }
+}
+
+if (typeof module !== "undefined") {
+  module.exports = {
+    waitingFromOutput: waitingFromOutput
+  }
+}