add edit & delete post functionality with ownership checks

[GaneshKulakarni]

📌 Description

This PR implements the ability for users to edit and delete their own posts after publishing.

It ensures that only the post owner can access edit/delete actions and also adds a confirmation popup before deletion. Additionally, edited posts now display an edited timestamp/label.

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✅ Changes Implemented

• Added Edit Post option (visible only to post owner)
• Added Delete Post option (visible only to post owner)
• Added confirmation modal before deleting a post
• Added edited label/timestamp when a post is updated
• Added backend permission checks to prevent unauthorized edit/delete access

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🔐 Permission Handling

• Frontend: Edit/Delete buttons appear only if post.userId === loggedInUserId
• Backend: API validates ownership before updating/deleting

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🛠️ Related Issue

Closes #23

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🧪 Testing Done

• ✅ Logged in user can edit their own post
• ✅ Logged in user can delete their own post
• ✅ Non-owner cannot see edit/delete buttons
• ✅ Non-owner cannot edit/delete via API request
• ✅ Confirmation modal appears before delete
• ✅ Edited timestamp appears after update

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📷 Screenshots :

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📌 Checklist

• Feature implemented according to acceptance criteria
• Frontend and backend permission checks added
• Confirmation modal added
• Edited label/timestamp implemented
• Code tested locally
• No breaking changes introduced

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[github-actions]

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