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.

internal/atspi/mumble_test.go

@@ -6,6 +6,31 @@ package atspi
 
 import "testing"
 
+func TestMumbleTableRowText(t *testing.T) {
+	for _, test := range []struct {
+		name, process, label, row, want string
+		columns                         int
+		gui                             bool
+	}{
+		{"server label", "mumble", "Server Example", "Server Example, Server Example, Server Example", "Server Example", 3, true},
+		{"commas and Unicode", "mumble", "Server Example, 界", "Server Example, 界, Server Example, 界, Server Example, 界", "Server Example, 界", 3, true},
+		{"useful equal values", "mumble", "Server Example", "Server Example, 12, 12", "Server Example, 12, 12", 3, true},
+		{"mixed labels", "mumble", "Server Example", "Server Example, 12, Server Example", "Server Example, 12, Server Example", 3, true},
+		{"unrelated provider", "other", "Same", "Same, Same, Same", "Same, Same, Same", 3, true},
+		{"document table", "mumble", "Same", "Same, Same, Same", "Same, Same, Same", 3, false},
+		{"single column", "mumble", "Server Example", "Server Example", "Server Example", 1, true},
+		{"empty cells", "mumble", "", "", "", 3, true},
+	} {
+		t.Run(test.name, func(t *testing.T) {
+			snapshot := Snapshot{ApplicationProcess: test.process, Role: "table cell", Name: test.label,
+				TableRowText: test.row, TableColumnCount: test.columns, GUITable: test.gui}
+			if got := mumbleTableRowText(snapshot); got != test.want {
+				t.Fatalf("row = %q, want %q", got, test.want)
+			}
+		})
+	}
+}
+
 func TestMumbleMessageText(t *testing.T) {
 	for _, test := range []struct{ input, want string }{
 		{"[12:34:56]", ""},