fix(oxlint): guard runOxlint against spawn errors (#679)

[maiolica]

What

Hardens runOxlint against spawn failures so a failed oxlint invocation
can no longer crash the Vite dev server.

runOxlint calls node:child_process.exec but doesn't handle:

• synchronous throws from exec() itself, or
• async 'error' events emitted on the returned ChildProcess (these
  fire before the exit callback runs).

In large pnpm monorepos where oxlint is re-run on every file change, the
spawn can intermittently fail (e.g. resource pressure under a flurry of
changes). The unhandled error currently takes down the whole dev server.

Change

Wrap the exec() call in try/catch and attach a child.on('error', ...)
listener. Both paths resolve to an empty diagnostics array, which the rest
of the checker already treats as a clean run — so a transient spawn failure
is silently swallowed and the next run can succeed.

Notes

Fixes the second issue reported in #679. The first issue in that thread
(file:// URI handling in normalizePath) was already addressed by #714.

This mirrors a verified pnpm patch running in production.

Closes #679

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