Restart LSP when it's stale

[hicder]

Description

rust-analyzer gets stale easily, especially when there are a lot of edits that it couldn't catch up. In that case, we should just restart the LSP.

OpenCode version

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Steps to reproduce

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Operating System

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Terminal

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[github-actions[bot]]

This issue might be a duplicate of existing issues. Please check:

• #2156: Stale LSP errors - discusses how stale error diagnostics from LSP confuse Claude when it can't see the actual state
• #2694: stale rust-analyzer errors during edits - addresses the same problem of stale warnings/errors from rust-analyzer not resolving until rebuild

Feel free to ignore if none of these address your specific case.