fix: Add pasp box to declare square pixels (1:1) for web playback

The codec string fix caused videos to appear squished on web players
like Shaka. Adding an explicit pixel aspect ratio (pasp) box with
1:1 ratio tells the player not to apply any SAR scaling.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

package/android/src/main/java/com/mrousavy/camera/core/HlsMuxer.kt

@@ -753,10 +753,23 @@ class HlsMuxer(
         dos.writeShort(-1)              // pre-defined
 
         output.write(buildAvcCBox(sps, pps))
+        output.write(buildPaspBox())
 
         return wrapBox("avc1", output.toByteArray())
     }
 
+    /**
+     * Builds pixel aspect ratio box to explicitly declare square pixels (1:1).
+     * This helps players correctly interpret video dimensions without SAR scaling.
+     */
+    private fun buildPaspBox(): ByteArray {
+        val output = ByteArrayOutputStream()
+        val dos = DataOutputStream(output)
+        dos.writeInt(1)  // hSpacing (horizontal)
+        dos.writeInt(1)  // vSpacing (vertical)
+        return wrapBox("pasp", output.toByteArray())
+    }
+
     private fun buildAvcCBox(sps: ByteArray, pps: ByteArray): ByteArray {
         val output = ByteArrayOutputStream()
         val dos = DataOutputStream(output)