[Labreo]

🎯 What:
Refactored normalizeArtist in content.js to delegate initial string cleaning (lowercasing, whitespace trimming and collapsing, zero-width character removal) to normalizeEntry from storage.js.

💡 Why:
Eliminates duplicate normalization logic across files and ensures consistent string sanitization rules across the extension while preserving the specific non-word character stripping for artist names.

✅ Verification:
Executed npm test and verified all unit tests (including normalizeArtist.test.js) pass. Ran ./build.sh to confirm extension packaging succeeds.

✨ Result:
Cleaner code maintainability and eliminated logic duplication.

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PR created automatically by Jules for task 3703692011367422370 started by @Labreo

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