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/Service.qml

@@ -0,0 +1,60 @@
+import QtQuick
+import Quickshell.Io
+import "TmuxModel.js" as TmuxModel
+
+Item {
+  id: root
+
+  // Injected by omarchy-shell (the first-party service loader).
+  property var shell: null
+
+  property int waitingCount: 0
+  property string tooltip: ""
+  property bool refreshPending: false
+
+  readonly property bool waiting: waitingCount > 0
+
+  // A bar surface exists per monitor and each one instantiates the indicator
+  // twice (active and inactive block), so the probe lives here instead: one
+  // process for the whole shell, and every indicator reads the same answer.
+  function refresh() {
+    if (statusProc.running) refreshPending = true
+    else statusProc.running = true
+  }
+
+  // tmux hooks cover the flag transitions, but output in a selected window
+  // whose terminal sits on another workspace never fires one, and neither does
+  // a window or session killed while it was still flagged.
+  Timer {
+    interval: 3000
+    running: true
+    repeat: true
+    onTriggered: root.refresh()
+  }
+
+  Process {
+    id: statusProc
+    command: ["omarchy-tmux-alert", "show", "--json"]
+    stdout: StdioCollector {
+      waitForEnd: true
+      onStreamFinished: {
+        var waiting = TmuxModel.waitingFromOutput(text)
+        root.waitingCount = waiting.count
+        root.tooltip = waiting.tooltip
+      }
+    }
+    onExited: function(exitCode) {
+      if (exitCode !== 0) {
+        root.waitingCount = 0
+        root.tooltip = ""
+      }
+
+      if (root.refreshPending) {
+        root.refreshPending = false
+        root.refresh()
+      }
+    }
+  }
+
+  Component.onCompleted: refresh()
+}