Add a "Merge VoiceIDs" feature to link duplicate speaker profiles caused by varying audio quality

The Problem: WaveAI generally does a fantastic job learning and remembering individual voices across sessions. However, if a person's audio quality changes—such as switching from a high-quality headset to a phone mic, or dealing with background noise—the system often gets tricked into creating a completely new, duplicate VoiceID for them. The Fix Allow users to manually merge these fragmented VoiceIDs within the system's speaker directory. Users should be able to select "VoiceID A (Clear)" and "VoiceID B (Muffled)" and combine them into a single profile. Bonus Benefit This makes the platform's speaker recognition exponentially smarter over time. It actively trains the AI to recognize a person's voice regardless of their environment or equipment, ensuring far more accurate automatic labeling in future recordings.