⚡ Bolt: Pre-compile punctuation Regex in VoiceInputManager

[LeanBitLab]

💡 What: Extracted inline Regex("[,.?!;:]") in VoiceInputManager.syncRecognizedText into a companion object private val PUNCTUATION_REGEX.
🎯 Why: syncRecognizedText is a hot-path method called repeatedly during voice typing updates. Pre-compiling the regex avoids repeated runtime regex compilation and unnecessary object allocation per word/partial phrase.
📊 Expected Impact: Lower GC pressure and minor latency reduction in voice typing input hot path.
🔬 Verification: Standard debug build and unit tests passed. Ensured zero em dashes were introduced.

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PR created automatically by Jules for task 5017433685908041869 started by @LeanBitLab

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