feat: cleanup pending timeouts on component unmount

[Priyanshu1-62]

Pull Request

Summary

• Improved timeout lifecycle management in the AI assistant component by tracking all scheduled timeouts and clearing pending ones during component unmount.
• This prevents delayed state updates and navigation callbacks from executing after the component has been removed, making the component more resilient during rapid navigation and unmount/remount scenarios.

Description

• Added a useRef with a Set to track active timeout IDs.
• Introduced a scheduleTimeout helper to centralize timeout registration and to automatically remove completed timers from the tracking set.
• Replaced direct setTimeout calls with scheduleTimeout across delayed bot responses and login redirection flows.
• Extended the component cleanup function to clear all pending timeouts.

Related Issue

Fixes #478

Type of Change

• Bug fix
• New feature
• Enhancement
• Documentation update
• UI/UX improvement
• Refactoring

Checklist

• Code follows project guidelines
• Tested locally
• No console errors
• Documentation updated if required

Additional Details

• Labels: GSSoC'2026, type: enhancement, type: performance