[KillianHzr]

Summary

In the collection's Pokédex grid view (DexGridView), species cells displayed normal sprites even when the species was owned as shiny. The shiny sprite was only displayed inside the individual detail page (PokemonDetailView) or momentarily when returning from it.

This happened because DexSpeciesCell gated shiny rendering on species.isShiny && isSelected. In older iterations of the Pokédex grid, tapping a cell selected it in place; once tapping was updated to open the full detail sheet, cells in the grid were never selected in place, leaving shiny species stuck on their normal sprites.

This change renders shiny sprites directly for collected shiny species in DexSpeciesCell (while still allowing individual normal/shiny appearance selection in the detail view), and adds automated rendering regression tests in DexColorRenderingTests.

Type of change

• Bug fix
• New feature
• Refactor / cleanup
• Documentation
• Other:

UI changes

Before	After
In the Pokédex grid view, owned shiny Pokémon showed a ✨ badge but their sprite was normal (non-shiny). Opening the detail view was required to see the shiny sprite.	Owned shiny Pokémon in the Pokédex grid view directly display their shiny sprite matching their ✨ badge.

Checklist

• swift build and swift test pass locally
• PR title and description are written in English
• UI changes are described above (before/after — images optional)
• No copyrighted assets, secrets, or private tooling references are committed (see CONTRIBUTING)
• Tests were added or updated for this change (DexColorRenderingTests.testPokedexGridRendersShinySpeciesColor)