3257

Added

• Animated Switch Button Support — DeltaSkinButton now carries selfRetracting (momentary toggle) and DeltaSkinButtonStates gains selected + switchAnimation (spring-curve config) for Manic skin parity.
• Extended Function Buttons — DeltaSkinInputHandler now handles 40+ shortcut actions including screenshot, restart, quit, saveStates, cheatCodes, skins, filters, speedMenu, toggleAnalog, swapDiscs, coreOptions, moreInfo, and hold-style slowMotion.
• Full APNG/GIF Background Animation — DeltaSkinAnimatedBackgroundView uses CGImageSource to extract every frame from APNG/GIF files instead of showing only the first frame.
• Platform Controller Grouping — DeltaSkinGameType gains skinLayoutGroup and isInSharedLayoutGroup so MD/Sega CD/32X and Master System/Game Gear/SG-1000 (and GB/GBC, PCE/PCECD) share skin layouts automatically.