Code review:

- Use the app's cached stringRes helper instead of raw stringResource,
  matching the dominant convention in ui/note/types
- Drive the icon animation from the Compose frame clock (withFrameMillis)
  instead of a delay loop, so the ticker suspends whenever the composition
  stops drawing rather than waking the main dispatcher 4x/sec from the
  back stack
- Drop the unconsumed memoryCardId/blockState/blockHash accessors; the
  tag schema stays documented in the class KDoc
- Document the frames arrays as frozen: mutating them in place would
    silently break the @Immutable skip contract; build a new instance
    to change pixels
- Replace the API-29-deprecated Bitmap.createBitmap(IntArray, ...)
    overload with createBitmap(w, h, config) + setPixels

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/note/types/Ps1Save.kt

@@ -37,22 +37,22 @@ import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableIntStateOf
 import androidx.compose.runtime.remember
 import androidx.compose.runtime.setValue
+import androidx.compose.runtime.withFrameMillis
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.FilterQuality
 import androidx.compose.ui.graphics.asImageBitmap
-import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.text.font.FontFamily
 import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.dp
 import com.vitorpamplona.amethyst.R
 import com.vitorpamplona.amethyst.model.Note
+import com.vitorpamplona.amethyst.ui.stringRes
 import com.vitorpamplona.amethyst.ui.theme.Size24dp
 import com.vitorpamplona.amethyst.ui.theme.placeholderText
 import com.vitorpamplona.amethyst.ui.theme.replyModifier
 import com.vitorpamplona.quartz.experimental.ps1saves.Ps1SaveEvent
 import com.vitorpamplona.quartz.experimental.ps1saves.Ps1SaveIcon
-import kotlinx.coroutines.delay
 
 /** How many hex characters of the block to preview (the full block is ~16K chars). */
 private const val HEX_PREVIEW_CHARS = 192
@@ -102,7 +102,7 @@ fun RenderPs1Save(baseNote: Note) {
                 Spacer(Modifier.width(8.dp))
             }
             Text(
-                text = (if (save.icon == null) FLOPPY_PREFIX else "") + (save.title ?: stringResource(R.string.ps1_save_title)),
+                text = (if (save.icon == null) FLOPPY_PREFIX else "") + (save.title ?: stringRes(R.string.ps1_save_title)),
                 style = MaterialTheme.typography.titleMedium,
                 maxLines = 2,
                 overflow = TextOverflow.Ellipsis,
@@ -113,7 +113,7 @@ fun RenderPs1Save(baseNote: Note) {
             listOfNotNull(
                 save.filename,
                 save.region,
-                save.blockNumber?.let { stringResource(R.string.ps1_save_block, it) },
+                save.blockNumber?.let { stringRes(R.string.ps1_save_block, it) },
             ).joinToString(" · ")
 
         if (details.isNotEmpty()) {
@@ -151,7 +151,8 @@ private fun Ps1SaveIconImage(icon: Ps1SaveIcon) {
         remember(icon) {
             icon.frames.map { pixels ->
                 Bitmap
-                    .createBitmap(pixels, Ps1SaveIcon.SIZE, Ps1SaveIcon.SIZE, Bitmap.Config.ARGB_8888)
+                    .createBitmap(Ps1SaveIcon.SIZE, Ps1SaveIcon.SIZE, Bitmap.Config.ARGB_8888)
+                    .apply { setPixels(pixels, 0, Ps1SaveIcon.SIZE, 0, 0, Ps1SaveIcon.SIZE, Ps1SaveIcon.SIZE) }
                     .asImageBitmap()
             }
         }
@@ -159,10 +160,14 @@ private fun Ps1SaveIconImage(icon: Ps1SaveIcon) {
     var frameIndex by remember(icon) { mutableIntStateOf(0) }
 
     if (frames.size > 1) {
+        // Driven by the frame clock (not delay) so the ticker suspends whenever
+        // the composition stops drawing (backgrounded, behind another screen).
         LaunchedEffect(icon) {
+            val start = withFrameMillis { it }
             while (true) {
-                delay(ICON_FRAME_MILLIS)
-                frameIndex = (frameIndex + 1) % frames.size
+                withFrameMillis { now ->
+                    frameIndex = (((now - start) / ICON_FRAME_MILLIS) % frames.size).toInt()
+                }
             }
         }
     }

quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/experimental/ps1saves/Ps1SaveEvent.kt

@@ -71,18 +71,9 @@ class Ps1SaveEvent(
     /** Game region, from the `region` tag (may be null). */
     fun region() = tags.firstTagValue("region")
 
-    /** Identifier of the memory card this block belongs to, from the `m` tag (may be null). */
-    fun memoryCardId() = tags.firstTagValue("m")
-
     /** Block number within the card, from the `block` tag (null when missing or not a number). */
     fun blockNumber() = tags.firstTagValue("block")?.toIntOrNull()
 
-    /** Position of this block in a multi-block save chain, from the `state` tag (may be null). */
-    fun blockState() = tags.firstTagValue("state")
-
-    /** SHA-256 of the block data, from the `x` tag (may be null). */
-    fun blockHash() = tags.firstTagValue("x")
-
     /** Publisher-provided human-readable summary, from the NIP-31 `alt` tag (may be null). */
     fun summary() = tags.alt()
 

quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/experimental/ps1saves/Ps1SaveIcon.kt

@@ -35,12 +35,15 @@ import com.vitorpamplona.quartz.nip01Core.core.hexToByteArrayOrNull
  *            (bits 0-4 red, 5-9 green, 10-14 blue); raw `0x0000` is transparent.
  * - `0x80` — the frames, each 16×16 pixels at 4bpp (128 bytes), low nibble
  *            first; pixel values index the CLUT.
- *
- * [frames] holds one 256-entry row-major ARGB pixel array per animation frame,
- * ready to blit into a bitmap.
  */
 @Immutable
 class Ps1SaveIcon(
+    /**
+     * One 256-entry row-major ARGB pixel array per animation frame. Treat as
+     * frozen: the arrays back the class's `@Immutable` contract, so mutating
+     * them in place would not recompose — build a new [Ps1SaveIcon] to change
+     * pixels.
+     */
     val frames: List<IntArray>,
 ) {
     companion object {

quartz/src/commonTest/kotlin/com/vitorpamplona/quartz/experimental/ps1saves/Ps1SaveEventTest.kt

@@ -72,10 +72,7 @@ class Ps1SaveEventTest {
         assertEquals("SYNCED OVER NOST Card", event.saveTitle())
         assertEquals("BASCUS-00001SOFTCARD", event.filename())
         assertEquals("America", event.region())
-        assertEquals("synctest-f1fc95d1", event.memoryCardId())
         assertEquals(1, event.blockNumber())
-        assertEquals("first", event.blockState())
-        assertEquals("4235e8c1d7164927b78dd50e0a12acbea04b2d80f0864fc3298e7d84225d8f41", event.blockHash())
         assertEquals("PS1 save 'SYNCED OVER NOST Card' (BASCUS-00001SOFTCARD)", event.summary())
         assertEquals("synctest-f1fc95d1-1", event.dTag())
     }