Rewriter: Preserve interpolated ERB class names in tailwind rewriter

[marcoroth]

The tailwind-class-sorter was silently corrupting class names in attributes when ERB was used for interpolating class names. For example:

Input:

<div class="foo-<%= bar %>-100">

Output:

<div class="foo--100 <%= bar %>">

This happened because the sorter separated all literal nodes from ERB nodes and joined them together, losing the ERB's position within the class name.

This pull request adds detection for string interpolation patterns and skips sorting when they're found:

• Case 1: literal → ERB → literal with no whitespace at boundaries
  e.g., foo-<%= bar %>-100

• Case 2: ERB at start followed by literal without leading whitespace
  e.g., <%= prefix %>-blue-500

• Case 3: Literal ending with hyphen followed by ERB at end
  e.g., bg-<%= suffix %>

When interpolation is detected, sorting is skipped for that attribute value to prevent silent corruption. Classes inside nested conditionals are still sorted correctly.

Resolves #879

[pkg-pr-new]

npx https://pkg.pr.new/@herb-tools/formatter@1085

npx https://pkg.pr.new/@herb-tools/language-server@1085

npx https://pkg.pr.new/@herb-tools/linter@1085

commit: 3299d31

[github-actions]

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