[LeanBitLab]

💡 What: Removed the unused onDeleteMultiCharInput(multiCharLength: Int) method from app/src/main/java/helium314/keyboard/latin/utils/StatsUtils.kt.
🔍 Verification: Checked the repository via grep and confirmed zero references exist for this method. Verified via assembleStandardDebug and testStandardDebugUnitTest that no regressions were introduced.
📦 Impact: Cleaner codebase and reduced maintenance overhead.

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PR created automatically by Jules for task 16927321103234392245 started by @LeanBitLab

[google-labs-jules]

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[LeanBitLab]

Cherry-picked valid StatsUtils change into main in commit 2b55bc5 to prevent deleting .jules documentation.