Removed space before square brackets in CSS style attribute

[SHARMA1525]

Deno’s HTML formatter was incorrectly inserting a space before square brackets in CSS property values inside style attributes. For example:

animation-[value] → animation- [value]

This resulted in invalid CSS syntax and caused issues when using bracket-notation utilities.

This PR adds a post-processing step to preserve valid -[ sequences after malva formats inline CSS. The new fix_css_bracket_spacing() function removes unintended spaces between hyphens and [ characters in CSS property values, ensuring that patterns such as animation-[value] remain correct and unchanged.

Summary of Changes

Added fix_css_bracket_spacing() to normalize bracket syntax after malva’s CSS formatting.

Integrated this fix into the HTML formatting pipeline for inline CSS inside style attributes.

Verified that the example from the issue formats correctly without inserting unwanted spaces.

Confirmed that no other CSS formatting behavior is affected.

Testing & Validation

Added/updated tests to cover this behavior.

cargo test --manifest-path cli/Cargo.toml tools::fmt::test passes.

./tools/format.js runs without producing any diffs.

./tools/lint.js passes.

Checklist

Descriptive PR title

References related issue (#30991)

Tests cover the change

cargo test passes

./tools/format.js passes

./tools/lint.js passes

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[bartlomieju]

Thanks for the PR, but it feels to me like this should be fixed in https://github.com/g-plane/markup_fmt. Maybe it's actually already fixed and we only need to update the dependency.