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Describe the bug / provide steps to reproduce it

It is fine for smaller projects but when project gets larger, the dart language server gets extremely slow. It takes a lot of time to add a single field in the class constructor. Same goes for code completions and suggestions.

Zed Version and System Specs

Zed: v0.167.1 (Zed)
OS: macOS 15.2.0
Memory: 8 GiB
Architecture: aarch64

If applicable, add screenshots or screencasts of the incorrect state / behavior

If applicable, attach your Zed.log file to this issue.

[Zed.log](https://github.com/user-attachments/files/18317338/Zed.log)