1.0.0-RC6: Highlighting issue in IDEA when summoning an `MkRead` instance

Hi!

IDEA thinks that `LowerPriorityRead#generic` and `ReadPlatform#genericTuple` have the same priority.

Maybe we should move `ReadPlatform#genericTuple` to `MkReadPlatform`?

Repro:
```scala
implicitly[MkRead[(Int, String)]]
```

<img width="732" alt="image" src="https://github.com/user-attachments/assets/d6d87d52-5324-4ed1-b6ed-d7f4f2502d9e">

Same issue with `Read.derived`.