Added feedback form submission confirmation

[PranavKeshav24]

Related Issue

Issue #248

Description

I have added a feedback confirmation message to the FeedbackPage component. When users submit their feedback, a confirmation message will appear to acknowledge the successful submission. The confirmation message's color adjusts based on the current theme (light or dark mode).

Type of PR

• [X] Bug fix
• [ ] Feature enhancement
• [ ] Documentation update
• [ ] Other (specify): _______________

Screenshots / videos (if applicable)

Checklist:

• [X] I have performed a self-review of my code
• [X] I have read and followed the Contribution Guidelines.
• [X] I have tested the changes thoroughly before submitting this pull request.
• [X] I have provided relevant issue numbers, screenshots, and videos after making the changes.
• [X] I have commented my code, particularly in hard-to-understand areas.

Additional context:

Please review my PR and provide feedback. I'll be happy to work on any required changes.