Fix/chat timestamp

[adityayadav176]

Description

This PR improves chat message timestamp formatting to provide a cleaner and more user-friendly messaging experience.

Changes Made

• Added relative timestamp formatting for message separators.

• Replaced generic time display with contextual labels:

  • Just now
  • X minutes ago
  • X hours ago
  • Yesterday
  • Day of the week (e.g., Monday)
  • Full date for older messages (e.g., Jun 5, 2026)

• Kept message bubble timestamps concise while improving readability of conversation history.

Before

• 03:45 PM
• 08:12 PM
• 02:30 PM

After

• Just now
• 2 minutes ago
• 15 minutes ago
• 1 hour ago
• Yesterday
• Monday
• Jun 5, 2026

Benefits

• Better user experience and readability.
• Easier navigation through chat history.
• Modern timestamp behavior similar to popular messaging applications.

Closes #312

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📥 Commits

Reviewing files that changed from the base of the PR and between b6ebd50 and fd884b1.

⛔ Files ignored due to path filters (2)

• backend/package-lock.json is excluded by !**/package-lock.json
• frontend/package-lock.json is excluded by !**/package-lock.json

📒 Files selected for processing (6)

• backend/.env.example
• backend/package.json
• backend/src/controllers/user.controller.js
• backend/src/routes/user.route.js
• frontend/components/chat/MessageBubble.jsx
• frontend/pages/SettingsPage.jsx

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[adityayadav176]

H! @UTKARSHH20
Implemented the timestamp formatting enhancement requested in #312.

✅ Added human-readable relative timestamps (Just now, X minutes ago, X hours ago, Yesterday, weekday names, and formatted dates for older messages).

✅ Improved chat readability and overall user experience.

Please review and merge. Thanks!