Fix
- XPATH elements updated for ChatGPT, Gemini, and HuggingChat
- timeout_dur removed from super class initialization
- **base_browser**: Explicit timeout_dur setting, multihead waiting procedure
- **chatgpt**: Removed unnecessary waiting for send button
- **huggingface**: Model switch modal closes if fails
- **gemini**: Clicks the data privacy "Got it" button if pops up
- **multiagent**: Instead of launching browsers concurrently, launch them one after another, in sequence.