fix(linter): fix LSP panic from stale directive spans

[Boshen]

Summary

• Clear cached disable directives before re-linting a file to prevent using outdated spans
• Add remove method to DirectivesStore for per-path directive removal

Root Cause

The DirectivesStore caches disable directives per file path. When a file is edited and re-linted:

1. If linting succeeds and produces directives → they are updated in the store
2. If linting fails or doesn't produce directives (e.g., parse errors, partial loader files) → old directives remain in the store

When the file content changes between linting runs and the new linting fails to update directives, the stored directives contain spans calculated from the OLD source text. Using these stale spans with the NEW source text/rope causes the "byte index out of bounds" panic.

Fix

1. Added remove method to DirectivesStore for clearing directives for a specific file
2. Call remove before linting in IsolatedLintHandler::lint_path() to ensure stale directives are cleared

This ensures that when a file is re-linted, any stale directives from previous runs are cleared first. If the new linting run produces fresh directives, they'll be stored; if not, no stale directives will be used.

Test plan

• Existing LSP tests pass (73 tests)
• Unused directives tests pass

Closes #15415

🤖 Generated with Claude Code

[Copilot]

Pull request overview

This PR fixes an LSP panic caused by stale disable directive spans when re-linting files. The panic occurs when cached directives contain spans from old source text but are applied to new source text after the file changes.

Changes:

• Added a remove method to DirectivesStore to clear directives for a specific file path
• Clear cached directives before re-linting in IsolatedLintHandler::lint_path() to prevent stale span usage

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
crates/oxc_linter/src/lint_runner.rs	Adds remove method to clear directives for a specific path
apps/oxlint/src/lsp/isolated_lint_handler.rs	Clears stale directives before re-linting to prevent panics

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[codspeed-hq]

CodSpeed Performance Report

Merging this PR will not alter performance

_{Comparing fix/lsp-stale-directives-panic (41743cf) with main (9135b0b)}

Summary

✅ 4 untouched benchmarks
⏩ 41 skipped benchmarks¹

Footnotes

1. 41 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

[Sysix]

One little comment which should be non-blocking

[Sysix]

Merge activity

• Jan 16, 3:01 PM UTC: The merge label '0-merge' was detected. This PR will be added to the Graphite merge queue once it meets the requirements.
• Jan 16, 3:03 PM UTC: Sysix added this pull request to the Graphite merge queue.
• Jan 16, 3:11 PM UTC: Merged by the Graphite merge queue.