Install gliff by default and show when a remote session is active (#14712)

* Install gliff by default

Gliff is the Hyprland remote desktop over SSH. Ship it in the base
package set for new installs, with a migration for existing ones.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

* Show a bar indicator while a gliff remote session is active

The machine being controlled should make it obvious that someone is on
it. A first-party remote-session service watches Hyprland's screencast
events, which gliff-server triggers through ext-image-copy-capture, and
probes for the server process, picking up the ssh client address from
its environment. The RemoteSession indicator in the default tray lights
up in the urgent colour while a session runs, and a notification
announces each session start and end.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

* Address review of the remote session indicator

Probe only the current user's gliff-server processes, forward refresh
through the third-party service proxy so cloned indicator widgets can
re-probe, exercise the Hyprland screencast event path in the service
test with a grim capture instead of calling refresh by hand, and
describe the indicator as status only in the manual.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

* Drop the remote session notifications

The bar indicator is the signal; a toast on every connect and
disconnect is noise on top of it.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

* Tighten remote session detection after review

Hyprland reports a screencast stopped as soon as frames pause for half a
second and says nothing more when the server later exits, so poll every
two seconds while a session is active instead of trusting a stop event.
Match only the screencast event, not its screencastv2 twin, and debounce
the burst around one transition so it costs one probe. Move the probe
into its own script that the service and the test both run, poll for
state in the service test instead of fixed delays, and drop the unused
session count.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

---------

Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com>

shell/services/PluginFirstPartyServiceApi.qml

@@ -11,6 +11,8 @@ QtObject {
   property bool doNotDisturb: false
   property var activePlayer: null
   property var sourcePlayers: []
+  property bool active: false
+  property var peers: []
 
   property var _setIdleEnabled: null
   property var _setNightlight: null
@@ -18,6 +20,7 @@ QtObject {
   property var _runAction: null
   property var _playerKey: null
   property var _selectPlayer: null
+  property var _refresh: null
 
   function setIdleEnabled(value) {
     if (serviceId === "omarchy.idle" && _setIdleEnabled) _setIdleEnabled(!!value)
@@ -43,4 +46,8 @@ QtObject {
   function selectPlayer(playerId) {
     if (serviceId === "omarchy.media" && _selectPlayer) _selectPlayer(String(playerId || ""))
   }
+
+  function refresh() {
+    if (serviceId === "omarchy.remote-session" && _refresh) _refresh()
+  }
 }