Fix inlay hints reading from disk instead of editor buffer

[shulhi]

The inlay hints doesn't read the document from the buffer, but instead read it from disk. This causes stale position location when the document is edited, at least until you saved it. This stale position interferes with user inputs as well (see video).

This fixed it by reading from the buffer just like completion, etc. See rescript-lang/rescript-vscode#1179

Before/After.

Screen.Recording.2026-02-22.at.10.55.28.AM.mov

Screen.Recording.2026-02-22.at.11.04.41.AM.mov

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commit: f96d112