fix: clean unused import autofix whitespace

[fireairforce]

Summary

• remove horizontal whitespace when an entire unused import declaration is deleted while preserving its newline structure
• retain comments without recreating whitespace-only lines, including leading, trailing, block, and line-comment cases
• clean adjacent horizontal spacing in partial import fixes without disturbing used specifiers or comma placement
• add autofix snapshots for default, named, namespace, type-only, multiline, and comment-adjacent imports
• verify a second fix pass is a no-op

Parser audit

• linted original and fixed JavaScript/TypeScript fixtures with explicit parse assertions
• snapshot validation reparses every fixed output
• no Yuku parser regression observed with v0.9.1

Testing

• zig build test --summary all — 1957/1957 tests passed; 11/11 rule snapshots passed
• zig build
• git diff --check

Closes #1095

[codspeed-hq]

Merging this PR will not alter performance

⚠️ Unknown Walltime execution environment detected

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For the most accurate results, we recommend using CodSpeed Macro Runners: bare-metal machines fine-tuned for performance measurement consistency.

✅ 1 untouched benchmark

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_{Comparing zoomdong/issue-1095-unused-import-whitespace (341e871) with main (ab5c509)}