Vista gets its own button (row 2, next to APPS)

The Art-Net heartbeat moves from APPS to a VISTA tile ("VISTA / SILENT";
"VISTA SILENT" on SHOW and ALL), hold starts Vista if it is not running.
SHOW now groups MIDI, APPS and VISTA. Tested live before the move: closing
Vista and Resolume alarmed, and each hold brought them back (Vista 5 s,
Arena 9 s after the hold).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/test_status_panel.py

@@ -226,6 +226,12 @@ class TestChecks(unittest.TestCase):
         self.assertEqual(sp.check_artnet(chk, self.snap, self.ctx)[0][1].level, sp.OK)
         self.snap.artnet_since = None                              # could not listen: no verdict
         self.assertEqual(sp.check_artnet(chk, self.snap, self.ctx)[0][1].level, sp.OK)
+        # its own button: "VISTA / SILENT", and the groups say "VISTA SILENT"
+        self.snap.artnet_since, self.snap.artnet_last = self.now - 60, {"10.1.10.206": self.now - 8}
+        tiles, _ = run_steps(sp.Engine(CONFIG), self.snap, self.now, 4)
+        self.assertEqual(tiles["vista"]["x"], "VISTA\nSILENT")
+        self.assertEqual(tiles["show"]["x"], "SHOW\nVISTA SILENT")
+        self.assertEqual(tiles["apps"]["x"], "APPS\nOK")
 
     def test_artnet_listener_hears_a_poll(self):
         import socket as _s
@@ -527,7 +533,8 @@ class TestFixes(unittest.TestCase):
         self.snap.mdns = self.snap.mdns - {"Lighting PC"}
         self.assertEqual(self.plan("obs"), [("fix", "obs")])
         self.assertEqual(self.plan("arena"), [("fix", "arena")])
-        self.assertEqual(self.plan("apps"), [("fix", "vista")])
+        self.assertEqual(self.plan("vista"), [("fix", "vista")])
+        self.assertEqual(self.plan("apps"), [])
         # Restarting rtpMIDI drops every session and does not rejoin them (2026-10-08): the hold
         # starts rtpMIDI only if it is not running, and reconnects the peer from the Mac's side.
         self.assertEqual(sorted(self.plan("midi")), [("fix", "midi_reconnect"), ("fix", "rtpmidi_start")])