Add voice input support to AI chatbot

[spandana-yellamelli]

Pull Request

Description

Added voice input support to the AI chatbot using the Web Speech API.

Features Added

• Added microphone button to chatbot input
• Enabled speech-to-text conversion
• Added start/stop voice recording functionality
• Added listening indicator while recording

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Closes #479

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Screenshots

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Type of change

• New feature (non-breaking change which adds functionality)

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Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

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