Super Metroid v0.3.15 - Steam Deck visual fixes

This update fixes four visual defects reported during Steam Deck testing:

• Keeps HUD and minimap pixels inside their native horizontal area, removing
  stray rows across widescreen margins.
• Preserves the centered pause menu throughout unpause fades, preventing menu
  graphics from being drawn as expanded room scenery.
• Extends the Morph Ball Eye's light cone into widescreen margins, including
  moving-camera frames.
• Clips static and parallax backgrounds at authored room boundaries, avoiding
  wrapped unused tilemap columns outside the room.

Validation includes all 15 native tests on each release platform, 28 captured
scene/aspect combinations, and matching simulation traces across stock,
widescreen and 90 Hz presentation modes. The tester completed the previous
release's campaign without lockups; these fixes have not yet received a full
Steam Deck campaign retest.

Gameplay audio crackles, the reported Brinstar map-close timing stutter, and
broader enemy/effect culling remain under investigation. Original-game
comparisons confirmed the reserve gauge's partial-fill animation and the
Etecoons stopping their song after pausing; those behaviors are unchanged.

Downloads are precompiled runtimes for Windows x64, Linux x64, macOS Apple
Silicon and macOS Intel. Supply your own unmodified Super Metroid (Japan, USA)
ROM. Extract the complete package; on Linux use Launch.sh. Keep native in-game
SRAM and settings when updating. Host save states are specific to their build.