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 {

internal/media/probe_test.go

@@ -94,3 +94,36 @@ func TestParseRationalFPS(t *testing.T) {
 		}
 	}
 }
+
+func TestParseProbeJSON_H264PixFmtCompatibility(t *testing.T) {
+	makeSample := func(pixFmt string) []byte {
+		return []byte(`{
+			"format": {"duration": "10.0"},
+			"streams": [{"index": 0, "codec_type": "video", "codec_name": "h264", "width": 1280, "height": 720, "pix_fmt": "` + pixFmt + `"}]
+		}`)
+	}
+
+	okInfo, err := ParseProbeJSON(makeSample("yuv420p"), "clip.mp4", 100)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if !okInfo.BrowserNative {
+		t.Fatalf("expected yuv420p mp4 to be browser native")
+	}
+
+	hi10Info, err := ParseProbeJSON(makeSample("yuv420p10le"), "clip10.mp4", 100)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if hi10Info.BrowserNative {
+		t.Fatalf("expected 10-bit yuv420p10le mp4 NOT to be browser native")
+	}
+
+	fmt422Info, err := ParseProbeJSON(makeSample("yuv422p"), "clip422.mp4", 100)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if fmt422Info.BrowserNative {
+		t.Fatalf("expected yuv422p mp4 NOT to be browser native")
+	}
+}