Release 3.8.2.11: idle rev-cache, port-safe Connect, single-instance tray UX.

Faster unchanged polls; orphan-core cleanup on listen ports; clearer busy-port errors; cores only from binDir; incremental server list; CSP without Google Fonts; single-instance activates existing window; close-to-tray without kill-others or balloon.

Co-authored-by: Cursor <cursoragent@cursor.com>

internal/netcheck/ping_test.go

@@ -32,6 +32,30 @@ func TestPingProfileEmpty(t *testing.T) {
 	}
 }
 
+func TestSplitHostPort(t *testing.T) {
+	h, p := splitHostPort("example.com:8443", "443")
+	if h != "example.com" || p != "8443" {
+		t.Fatalf("%s %s", h, p)
+	}
+	h, p = splitHostPort("example.com", "443")
+	if h != "example.com" || p != "443" {
+		t.Fatalf("%s %s", h, p)
+	}
+	h, p = splitHostPort("[2001:db8::1]:443", "80")
+	if h != "2001:db8::1" || p != "443" {
+		t.Fatalf("%s %s", h, p)
+	}
+}
+
+func TestPingHostEmpty(t *testing.T) {
+	ctx, cancel := context.WithTimeout(context.Background(), time.Second)
+	defer cancel()
+	r := PingHost(ctx, "x", config.ProtocolNaive, "")
+	if r.OK || r.Error == "" {
+		t.Fatalf("%+v", r)
+	}
+}
+
 func TestProbeUDPSoftOKWhenSilent(t *testing.T) {
 	pc, err := net.ListenPacket("udp", "127.0.0.1:0")
 	if err != nil {