♻ refactor(mq-lang): add opening delimiter location to unclosed bracket errors

[harehare]

Enhance ExpectedClosingParen/Brace/Bracket errors to carry the opening token, enabling diagnostics to show both where the closing delimiter was expected and where the matching opening delimiter appears.

[codspeed-hq]

Merging this PR will improve performance by 16.05%

⚠️ Different runtime environments detected

Some benchmarks with significant performance changes were compared across different runtime environments,
which may affect the accuracy of the results.

Open the report in CodSpeed to investigate

⚡ 1 improved benchmark
✅ 28 untouched benchmarks

Performance Changes

	Benchmark	BASE	HEAD	Efficiency
⚡	eval_variable_assignment_chain	955.8 µs	823.6 µs	+16.05%

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_{Comparing refactor/unclosed-delimiter-diagnostics (619615f) with main (5d6a6c7)¹}

Footnotes

1. No successful run was found on main (1d300e6) during the generation of this report, so 5d6a6c7 was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩