feat & fix: UI improvements and new functional features

[KarenZita01]

📝 Summary

This PR is a consolidated update addressing multiple UI bugs and introducing new core functionalities as outlined in the current sprint.

🛠️ Changes

Features

• Bookmark Functionality (Feature: Add bookmark functionality #210): Added the ability for users to save and organize content for quick access.
• Bulk Operations (Feature: Add bulk operations #212): Implemented logic and UI for bulk delete and bulk edit actions.

Bug Fixes

• Footer Alignment (Bug: Footer alignment issues on small screens #209): Adjusted CSS Flexbox/Grid properties to ensure proper alignment on small screens.
• Tooltip Positioning (Bug: Tooltip positioning inconsistent #211): Updated positioning logic to ensure tooltips stay within the viewport bounds.

🔗 Linked Issues

Closes #209
Closes #210
Closes #211
Closes #212

🧪 Testing

• Verified footer responsiveness on iPhone 12 and Pixel 5.
• Confirmed tooltips flip direction when near the edge of the screen.
• Successfully performed bulk delete on 50+ items in the staging environment.

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@KarenZita01 Great news! 🎉 Based on an automated assessment of this PR, the linked Wave issue(s) no longer count against your application limits.

You can now already apply to more issues while waiting for a review of this PR. Keep up the great work! 🚀

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