fix: Wails file drop, duplicate listeners, trim drag, crop stage, preview cache/pixfmt, NSIS temp quoting

internal/media/probe.go

@@ -198,6 +198,11 @@ func parseRationalFPS(expr string) float64 {
 	return 0
 }
 
+func IsH264BrowserNativePixFmt(pixFmt string) bool {
+	p := strings.ToLower(strings.TrimSpace(pixFmt))
+	return p == "" || p == "yuv420p" || p == "yuvj420p"
+}
+
 func isBrowserNative(info *VideoInfo) bool {
 	extOK := info.Extension == ".mp4" || info.Extension == ".m4v" || info.Extension == ".webm"
 	if !extOK {
@@ -207,6 +212,9 @@ func isBrowserNative(info *VideoInfo) bool {
 	if !vOK {
 		return false
 	}
+	if info.VideoCodec == "h264" && !IsH264BrowserNativePixFmt(info.PixFmt) {
+		return false
+	}
 	// If multiple audio tracks exist, browser plays only track 0; if user wants to preview natively it's fine,
 	// we still treat single-compatible audio as native.
 	for _, a := range info.AudioStreams {