perf(video): reduce jitter and per-recomposition work in note video pipeline

Tightens the hot path that runs whenever a video appears inside a note
in the feed (RichText -> ZoomableContentView -> VideoView).

- VideoView: resolve aspect ratio once per (uri, dim), and prime
  MediaAspectRatioCache from the imeta dim tag so repeat appearances
  (PiP, dialog, list re-enter) don't have to wait for ExoPlayer's
  onVideoSizeChanged before reserving layout space.
- VideoView: key the manual "tap to show" toggle on videoUri so a
  recycled feed slot doesn't inherit stale state from the previous video.
- VideoViewInner: hoist proxyPortForVideo() into a remember(videoUri) —
  the result was being recomputed every recomposition only to be dropped
  by GetMediaItem's URI-keyed remember.
- RenderVideoPlayer: stop holding container size in compose state.
  The size is only read in onDoubleTap, so a non-state IntArray holder
  removes a recomposition of the whole player tree on every layout pass.
  Also memoize isLiveStreaming() so the .m3u8 substring scan doesn't run
  on every recomposition.
- RenderTopButtons: same isLiveStreaming() memoization.
- GetVideoController: switch the remaining non-lambda Log.d call to the
  lambda overload so the message string isn't formatted when the log
  level is filtered out.

amethyst/src/main/java/com/vitorpamplona/amethyst/service/playback/composable/GetVideoController.kt

@@ -52,7 +52,7 @@ fun GetVideoController(
                 if (BackgroundMedia.isPlaying()) {
                     // There is a video playing, start this one on mute.
                     state.controller.volume = 0f
-                    Log.d("PlaybackService", "OnEach Muted due to BackgroundMedia.isPlaying")
+                    Log.d("PlaybackService") { "OnEach Muted due to BackgroundMedia.isPlaying" }
                 } else {
                     // There is no other video playing. Use the default mute state to
                     // decide if sound is on or not.

amethyst/src/main/java/com/vitorpamplona/amethyst/service/playback/composable/RenderVideoPlayer.kt

@@ -34,7 +34,6 @@ import androidx.compose.ui.geometry.Size
 import androidx.compose.ui.input.pointer.pointerInput
 import androidx.compose.ui.layout.ContentScale
 import androidx.compose.ui.layout.onSizeChanged
-import androidx.compose.ui.unit.IntSize
 import androidx.media3.common.Player
 import androidx.media3.common.util.UnstableApi
 import androidx.media3.ui.compose.ContentFrame
@@ -90,19 +89,22 @@ fun RenderVideoPlayer(
     hasBlurhash: Boolean = false,
     accountViewModel: AccountViewModel,
 ) {
-    val containerSize = remember { mutableStateOf(IntSize.Zero) }
-    val isLive = isLiveStreaming(mediaItem.src.videoUri)
+    // Hold the container size in a non-state holder so layout passes don't trigger an
+    // unnecessary recomposition of the whole player tree just to update a value that is only
+    // ever read inside the onDoubleTap callback below.
+    val containerWidth = remember { intArrayOf(0) }
+    val isLive = remember(mediaItem.src.videoUri) { isLiveStreaming(mediaItem.src.videoUri) }
 
     Box(
         modifier =
             borderModifier
-                .onSizeChanged { containerSize.value = it }
+                .onSizeChanged { containerWidth[0] = it.width }
                 .pointerInput(isLive, controllerState) {
                     detectTapGestures(
                         onTap = { controllerVisible.value = !controllerVisible.value },
                         onDoubleTap = { offset ->
                             if (!isLive) {
-                                val isLeftSide = offset.x < containerSize.value.width / 2
+                                val isLeftSide = offset.x < containerWidth[0] / 2
                                 if (isLeftSide) {
                                     controllerState.controller.seekBackward()
                                 } else {

amethyst/src/main/java/com/vitorpamplona/amethyst/service/playback/composable/VideoView.kt

@@ -105,15 +105,29 @@ fun VideoView(
     thumbhash: String? = null,
 ) {
     val initialAutoStart = if (alwaysShowVideo) true else accountViewModel.settings.startVideoPlayback()
-    val automaticallyStartPlayback = remember { mutableStateOf(initialAutoStart) }
+    // Reset the manual-show toggle when the video URI changes so a recycled feed slot
+    // doesn't inherit "tapped to show" state from a prior video.
+    val automaticallyStartPlayback = remember(videoUri) { mutableStateOf(initialAutoStart) }
 
     // Once the video is being shown, only honor the user's autoplay preference when it was auto-loaded.
     // If the user manually tapped the download button, they want it to play.
     val autoplay = alwaysShowVideo || (initialAutoStart && accountViewModel.settings.autoPlayVideos()) || (!initialAutoStart && automaticallyStartPlayback.value)
 
-    if (blurhash == null && thumbhash == null) {
-        val ratio = dimensions?.aspectRatio() ?: MediaAspectRatioCache.get(videoUri)
+    // Resolve the aspect ratio once per composition. Prime the URL-keyed cache from the imeta
+    // dim tag so the next time this video appears (PiP, dialog, list re-enter) the cache hits
+    // without waiting for ExoPlayer's onVideoSizeChanged.
+    val ratio =
+        remember(videoUri, dimensions) {
+            val fromDim = dimensions?.takeIf { it.hasSize() }
+            if (fromDim != null) {
+                MediaAspectRatioCache.add(videoUri, fromDim.width, fromDim.height)
+                fromDim.aspectRatio()
+            } else {
+                MediaAspectRatioCache.get(videoUri)
+            }
+        }
 
+    if (blurhash == null && thumbhash == null) {
         val modifier =
             if (ratio != null && automaticallyStartPlayback.value) {
                 Modifier.aspectRatio(ratio)
@@ -149,8 +163,6 @@ fun VideoView(
             }
         }
     } else {
-        val ratio = dimensions?.aspectRatio() ?: MediaAspectRatioCache.get(videoUri)
-
         val modifier =
             if (ratio != null) {
                 Modifier.aspectRatio(ratio)

amethyst/src/main/java/com/vitorpamplona/amethyst/service/playback/composable/VideoViewInner.kt

@@ -59,6 +59,11 @@ fun VideoViewInner(
     // keeps a copy of the value to avoid recompositions here when the DEFAULT value changes
     val muted = remember(videoUri) { DEFAULT_MUTED_SETTING.value }
 
+    // The proxy port is decided once per video URI; recomputing on every recomposition does
+    // pointless work (the result is anyway dropped because GetMediaItem.remember is keyed on the
+    // URI alone, so the cached MediaItemData is locked in on the first frame).
+    val proxyPort = remember(videoUri) { accountViewModel.httpClientBuilder.proxyPortForVideo(videoUri) }
+
     GetMediaItem(
         videoUri = videoUri,
         title = title,
@@ -67,7 +72,7 @@ fun VideoViewInner(
         callbackUri = nostrUriCallback,
         mimeType = mimeType,
         aspectRatio = aspectRatio,
-        proxyPort = accountViewModel.httpClientBuilder.proxyPortForVideo(videoUri),
+        proxyPort = proxyPort,
         keepPlaying = true,
         waveformData = waveform,
         isLiveStream = isLiveStream,

amethyst/src/main/java/com/vitorpamplona/amethyst/service/playback/composable/controls/RenderTopButtons.kt

@@ -105,7 +105,7 @@ fun RenderTopButtons(
     accountViewModel: AccountViewModel,
 ) {
     val context = LocalContext.current
-    val isLive = isLiveStreaming(mediaData.videoUri)
+    val isLive = remember(mediaData.videoUri) { isLiveStreaming(mediaData.videoUri) }
     val pipSupported =
         remember {
             context.packageManager.hasSystemFeature(PackageManager.FEATURE_PICTURE_IN_PICTURE)