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/protocols/xray/engine.go

@@ -11,6 +11,7 @@ import (
 	"time"
 
 	"vpnclient/internal/config"
+	"vpnclient/internal/listenutil"
 )
 
 // Engine runs official XTLS/Xray-core for VLESS / VMess / Trojan.
@@ -106,7 +107,11 @@ func (e *Engine) Start(ctx context.Context, profile config.Profile, binDir strin
 	var startErr error
 	select {
 	case <-done:
-		startErr = fmt.Errorf("xray: process exited immediately; check link and install-core (xray)")
+		socks, _ := profile.SOCKSListenHostPort()
+		httpL, _ := profile.HTTPListenHostPort()
+		startErr = listenutil.ClassifyStartFailure("xray",
+			fmt.Errorf("xray: process exited immediately; check link and install-core (xray)"),
+			socks, httpL)
 	case <-ctx.Done():
 		_ = e.Stop()
 		startErr = ctx.Err()