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## Summary
Implement a very basic hover in the playground and LSP.
It's basic, because it only shows the type on-hover. Most other LSPs
also show:
* The signature of the symbol beneath the cursor. E.g. `class
Test(a:int, b:int)` (we want something like
54f7da25f9/packages/pyright-internal/src/analyzer/typeEvaluator.ts (L21929-L22129))
* The symbols' documentation
* Do more fancy markdown rendering
I decided to defer these features for now because it requires new
semantic APIs (similar to *goto definition*), and investing in fancy
rendering only makes sense once we have the relevant data.
Closes [#16826](https://github.com/astral-sh/ruff/issues/16826)
## Test Plan
https://github.com/user-attachments/assets/044aeee4-58ad-4d4e-9e26-ac2a712026be
https://github.com/user-attachments/assets/4a1f4004-2982-4cf2-9dfd-cb8b84ff2ecb