Avoid repeating Mumble server labels across columns

Collapse identical full-row labels only for Mumble while preserving mixed column data and repeated values from other providers. Add Qt native coverage and document live saved-server listening confirmation.

tests/native_messaging.py

@@ -16,6 +16,7 @@ environment = dict(os.environ, GOCACHE="/tmp/cthulhu-go-cache", GOPROXY="off",
                    QT_LINUX_ACCESSIBILITY_ALWAYS_ON="1", NO_AT_BRIDGE="0")
 checks = [
     ("./internal/atspi", "TestNativeMumbleTranscriptCapture"),
+    ("./internal/atspi", "TestNativeMumbleTableRows"),
     ("./internal/atspi", "TestNativePidginTranscriptCapture"),
     ("./internal/app", "TestNativeMessagingCopyPreservesClipboardText"),
     ("./internal/platform/xorg", "TestNativeLearnModeCapturesKeysAndRestoresCommands"),