[Bug][Hotfix] Restrict Use Candies option in the Pokédex

[Wlowscha]

Why am I making these changes?

It was pointed out that using candies in the Pokédex during the shop phase can be exploited to dupe rewards for catching mons. #5444

What are the changes from a developer perspective?

Introducing a canUseCandies condition in the dex which is only true in whitelisted phases.

Screenshots/Videos

The option does not show up anymore, even though Pidgey has more than enough candies:

Checklist

• I'm using beta as my base branch
• There is no overlap with another PR?
• The PR is self-contained and cannot be split into smaller PRs?
• Have I provided a clear explanation of the changes?
• Have I tested the changes manually?
• Are all unit tests still passing? (npm run test)
  • Have I created new automated tests (npm run create-test) or updated existing tests related to the PR's changes?
• Have I provided screenshots/videos of the changes (if applicable)?
  • Have I made sure that any UI change works for both UI themes (default and legacy)?

[Wlowscha]

Following @DayKev's suggestion on discord, the code now allows to use candies in one of the whitelisted phases. This means that it is possible to use candies when checking the Dex in the title screen, while selecting starters, or during a run in the command phase, but not after the opponent faints or while picking items.

Video for proof:

Pokerogue.Mozilla.Firefox.2025-02-28.21-27-33.mp4