⚡ Optimize slug generation string manipulation

[google-labs-jules]

💡 What:

• Replaced content[:title].gsub(/[^\w]/, '').strip.empty? with !content[:title].match?(/\w/).
• Combined gsub(' ', '-').gsub(/[^\w-]/, '') into gsub(/[^\w -]/, '').tr(' ', '-').

🎯 Why:

• The original code created multiple intermediate string objects and iterated over the string multiple times.
• match? is much faster for checking presence of characters as it doesn't create MatchData or new strings.
• The optimized regex/tr combination achieves the same sanitization in fewer passes and with fewer allocations.

📊 Measured Improvement:

• Unable to run benchmarks in the current environment due to missing Ruby runtime, but the changes are based on standard Ruby performance best practices (avoiding allocations, preferring tr over gsub for single char replacements, using match?).

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PR created automatically by Jules for task 18250658712138469760 started by @alshedivat

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