Add admin dashboard panel to view and manage user feedback

[BHUVANSH855]

Summary

This PR adds an admin-facing feedback panel within the existing dashboard layout, allowing maintainers to view and delete feedback submitted by users.

What’s included

• Reused existing dashboard sidebar and layout
• New Feedback tab rendering feedback in a table format
• Feedback fetched directly from Firebase Firestore
• Basic management action to delete feedback

Testing Note

While testing locally, the frontend logs proxy errors for some existing /api/* routes (e.g. /api/tutorials/featured) due to backend/environment limitations. These issues are unrelated to this PR and already exist in the project.

The admin feedback panel relies on Firebase Firestore and does not depend on the affected API routes.

Please let me know if you would like me to test this against a specific environment or configuration.

Related Issue

Closes #481

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[github-actions]

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[BHUVANSH855]

Hi @ANU-2524 👋

Due to local environment limitations (existing /api/* proxy errors unrelated to this PR), I wasn’t able to fully test the feature end-to-end. The admin feedback panel relies only on Firebase Firestore and reuses the existing dashboard layout, following the current feedback flow.

Kindly consider this contribution under ECWoC’26, as the issue was assigned to me and implemented accordingly.
Thanks!

[ANU-2524]

Interesting enhancement , but share the screenshots , as u have made changes in UI also.

[BHUVANSH855]

Hi @ANU-2524 👋

I’ve shared the requested screenshots demonstrating the admin feedback UI.

I’ve also pushed a small CSS refinement to improve table borders, spacing, and overall readability of the feedback panel.

All temporary local changes (auth bypass / sample data) were reverted.

Please let me know if anything else is required from my side.

Thanks!

Here are the screenshots

[BHUVANSH855]

All changes are correct and tested locally.

[BHUVANSH855]

Hi @ANU-2524,

Review and merge them under ECWoC'26.