Release v1.3.8

PKsinew v1.3.8

⚠️ Important: Sprite packs have moved to the new packs/ directory.
Users must manually move existing sprite packs from the old location into the new folder structure for them to be detected.

NEW:
-Sprite Pack Manager with per-game pack support
-Custom sprite packs (place in packs/packname/normal/001.png or .gif and packs/packname/shiny/001.png or .gif)
-Support for animated .gif Pokémon sprites
-Fast Forward support in the internal emulator
-RetroPie provider

Improvements:
-All screens adjusted to use an internal virtual resolution of 640 x 480
-Trainer Card updated to match the new resolution
-Summary screen now shows Met Location, Origin Game, and Shiny indication
-Reduced text truncation on the summary screen
-Fast scrolling in the Pokédex when holding Up or Down
-Improved UX when using external providers and emulators
-Further separation of Ruby/Sapphire and Emerald handling to prevent achievement and event issues

Controls:
-When Fast Forward is enabled:
-L Shoulder toggles Fast Forward
-R Shoulder enables Fast Forward while held

Technical:
-Internal UI scaling refactor to support the new 640x480 virtual resolution system

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