fix: type annotation for View.add_item method

[fgfgdfgdfgfdgdf]

Summary

Fixes type annotation issue in View.add_item method where type checkers (Pylance/mypy) reported "Type of 'add_item' is partially unknown" due to missing generic parameter in Item annotation.

Checklist

• If code changes were made, then they have been tested
  • I have updated the documentation to reflect the changes
  • I have formatted the code properly by running uv run nox -s lint
  • I have type-checked the code by running uv run nox -s pyright
• This PR fixes an issue
• This PR adds something new (e.g. new method or parameters)
• This PR is a breaking change (e.g. methods or parameters removed/renamed)
• This PR is not a code change (e.g. documentation, README, ...)

[read-the-docs-community]

Documentation build overview

📚 disnake | 🛠️ Build #30212142 | 📁 Comparing 9dd5a8f against latest (0b11905)

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[Enegg]

Does this actually work for doing

view = View()
view.add_item(ui.Button())

?
The components are currently typed to default to None on creation unless explicitly parametrized (ui.Button[View](...))

[fgfgdfgdfgfdgdf]

Does this actually work for doing

view = View()
view.add_item(ui.Button())

? The components are currently typed to default to None on creation unless explicitly parametrized (ui.Button[View](...))

This doesn't work, and pylance gives me an error because the generic type of Item in the add_item method is unknown. If I specify Self or None, there will be no error

[Enegg]

pylance gives me an error because the generic type of Item in the add_item method is unknown.

I was asking specifically if this works after your fix, but it's clear now it is not as pyright in CI is failing.
Item[Self] likely needs to become Item[Any].