refactor(commons): extract PS1 memory-card save card to commons

Fifth batch of the note-ui-commons extraction, and the first to use the
platform-specific @Composable slot pattern the plan calls for (§3e/§4).

The PS1 save card (kind 38192) is pure value-in except for its animated
16×16 icon, which is decoded from raw memory-card pixels via Android Bitmap
APIs (createBitmap/setPixels/asImageBitmap) that can't move to commonMain.

- commons/ui/note/Ps1SaveCard.kt: the card takes decoded primitives (title,
  filename, region, block number, blank flag, hex preview) plus an
  `icon: (@Composable () -> Unit)?` slot; a null icon falls back to the
  floppy-disk emoji prefix. Labels resolve via commons Res.
- amethyst keeps the thin RenderPs1Save(Note) entry, which decodes the event
  and supplies the native Ps1SaveIconImage (the bitmap/frame-clock animation)
  as the icon slot.
- Migrated ps1_save_title/ps1_save_block/ps1_save_empty_slot with all locale
  translations into commons/composeResources; deleted the amethyst copies.

Verified: :commons:compileKotlinJvm and :amethyst:compileFdroidDebugKotlin
both pass; every touched strings.xml is well-formed.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Gmrt3jwYPDJ38MJGJ6GaNr

commons/src/commonMain/composeResources/values-cs/strings.xml

@@ -24,4 +24,7 @@
         <item quantity="many">%1$s +%2$d dalších</item>
         <item quantity="other">%1$s +%2$d dalších</item>
     </plurals>
+    <string name="ps1_save_title">Uložení na paměťovou kartu PS1</string>
+    <string name="ps1_save_block">blok %1$d</string>
+    <string name="ps1_save_empty_slot">Prázdný slot</string>
 </resources>