feat(pi-status): integrate desktop status bridge

Expose the persistent Pi session controls through the desktop launcher, Noctalia, and user service.

.config/systemd/user/pi-status-bridge.service

@@ -0,0 +1,13 @@
+[Unit]
+Description=Pi Status Bridge home agent
+After=graphical-session.target
+
+[Service]
+Type=simple
+Environment=PATH=/home/alex/.local/bin:/usr/local/bin:/usr/bin:/bin
+ExecStart=/home/alex/.local/bin/pi-status-bridge --session-root %h/.local/state/pi-status-bridge/sessions
+Restart=on-failure
+RestartSec=3
+
+[Install]
+WantedBy=default.target