bug:double '@' prefix in review live preview card and inconsistent handle formatting

[Kritika200520]

Description

When a user fills out the testimonial submission form, the live preview card on the right side of the page display double @ prefixes (e.g., @@username) if the user inputs their handle with an @ symbol.

Steps to Reproduce

1. Navigate to the /reviewform page.
2. In the "Platform & Handle" input field, type a handle starting with an @ symbol (e.g. @octocat).
3. Observe the live preview card on the right.

Expected Behavior

The handle in the live preview card should display as @octocat.

Screenshots / Logs

In app/reviewform/page.tsx, the live preview card unconditionally prepends an @ symbol to the user-entered handle:

<p className="text-xs text-gray-500 dark:text-gray-500">
  @{form.handle || 'handle'}
</p>

### GitHub Username (If applicable)

Kritika200520

### Environment

Chrome

[Kritika200520]

/claim

[github-actions]

🎉 Assigned! Welcome to the project, @Kritika200520.

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[shriya7756]

Hey, I am working on this for GSSoC 2026. Could you please assign this issue to me so that my PR can be reviewed?

[github-actions]

👋 Hey @shriya7756! Looks like you want to work on this issue — awesome! 🎉

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[Kritika200520]

/claim

[github-actions]

ℹ️ You are already assigned to this issue.