Feat/copy direct link

[Soumya1Kesharwani]

@komalharshita Ma'am..Please review my PR

Summary

Adds a "Copy Direct Link" button on project detail pages that copies the project URL to the clipboard and triggers a green toast notification with instant button text feedback (✓ Link Copied!).

Type of Change

Feature — adds new functionality
Test — adds or updates tests

What Was Changed

• src/templates/project.html: Added Copy Direct Link button, inline click handler, and #share-toast alert element.
• src/static/style.css: Added .share-toast and .btn-share-project.copied styles.
• src/static/script.js: Added global copyToClipboard and copyProjectLink handlers.
• tests/test_share_project.py: Added unit tests for Copy Direct Link button and toast element.

How to Test

1. Open http://127.0.0.1:5000/project/1 and click Copy Direct Link.
2. Verify button text turns green (✓ Link Copied!), link copies to clipboard, and toast pops up.
3. Run tests: pytest tests/test_share_project.py
   If everything looks good.Please merge it to main codebase.
   Below copy feature has been added.

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