fix(mac,linux): convert VideoMetadata.duration to milliseconds

nGetVideoDuration() returns seconds on macOS (CMTimeGetSeconds) and
Linux (GStreamer duration / GST_SECOND). Multiply by 1000 before
assigning to metadata.duration so the value matches the documented
millisecond contract and aligns with iOS, Android, Windows, and Web.

Fixes #153

Author: kdroidFilter

mediaplayer/src/jvmMain/kotlin/io/github/kdroidfilter/composemediaplayer/linux/LinuxVideoPlayerState.kt

@@ -379,7 +379,7 @@ class LinuxVideoPlayerState : VideoPlayerState {
         try {
             val width = LinuxNativeBridge.nGetFrameWidth(ptr)
             val height = LinuxNativeBridge.nGetFrameHeight(ptr)
-            val duration = LinuxNativeBridge.nGetVideoDuration(ptr).toLong()
+            val duration = (LinuxNativeBridge.nGetVideoDuration(ptr) * 1000).toLong()
             val frameRate = LinuxNativeBridge.nGetFrameRate(ptr)
             val newAspectRatio =
                 if (width > 0 && height > 0) {

mediaplayer/src/jvmMain/kotlin/io/github/kdroidfilter/composemediaplayer/mac/MacVideoPlayerState.kt

@@ -448,7 +448,7 @@ class MacVideoPlayerState : VideoPlayerState {
         try {
             val width = MacNativeBridge.nGetFrameWidth(ptr)
             val height = MacNativeBridge.nGetFrameHeight(ptr)
-            val duration = MacNativeBridge.nGetVideoDuration(ptr).toLong()
+            val duration = (MacNativeBridge.nGetVideoDuration(ptr) * 1000).toLong()
             val frameRate = MacNativeBridge.nGetVideoFrameRate(ptr)
 
             // Calculate aspect ratio