Title: Add ability to share scan result via shareable link

[NaitikVerma6776]

Description

Currently after scanning a URL, there is no way to share the result with someone else.
Users who find a suspicious link and want to warn others have to manually copy and
explain the result. A shareable link would make this much easier.

Expected Behaviour

After a scan completes (safe or danger), a "Share Result" button should appear on the
result card. Clicking it should generate a link like:

https://cybershield-url.netlify.app/?url=https://suspicious-site.com

Opening that link should auto-fill the URL input and immediately trigger the scan,
so the recipient sees the result without any extra steps.

Implementation Suggestion

• Add a "Share" button inside showResult() in script.js
• On click, construct window.location.origin + '?url=' + encodeURIComponent(scannedUrl)
  and copy it to clipboard using navigator.clipboard.writeText()
• On page load, check new URLSearchParams(window.location.search).get('url') —
  if present, auto-fill the input and call checkSecurity() automatically
• Show "Link copied!" feedback for ~2 seconds after clicking
• Button should use existing design tokens (no new dependencies)

Files to change

• script.js — update showResult() to add Share button, add URL param auto-scan on load
• style.css — add share button styles matching existing design system

heyy @Mrinalray ,I'd like to work on this issue.

[Divyanshu1916]

Hey @Mrinalray! I would like to work on this issue.

I will implement it by:

• Adding a Share button inside showResult() in script.js
• Constructing a shareable link using encodeURIComponent and copying it via navigator.clipboard.writeText()
• On page load, checking URLSearchParams for a url param to auto-fill and trigger checkSecurity()
• Showing 'Link copied!' feedback for ~2 seconds
• Adding share button styles in style.css matching existing design tokens

Please assign this to me!

[Mrinalray]

@Divyanshu1916 @NaitikVerma6776 assigned