fix: Register "Remember me" checkbox with react-hook-form

[visshalb2007]

Problem

The "Remember me" checkbox on the login page was visually interactive
but never registered with react-hook-form. As a result, data.rememberMe
was always undefined in onSubmit, making the checkbox non-functional.

Changes Made

File: client/src/pages/LoginPage.jsx

• Added {...register('rememberMe')} to the checkbox input so its
  value is captured on form submission
• Added cursor-pointer to the wrapping <label> for better UX

Before

{/* value never captured */}

After

Testing

• Checkbox value (true/false) is now accessible via data.rememberMe in onSubmit
• Clicking the label text toggles the checkbox
• No existing functionality broken

Note

Actual persistence logic (longer token expiry / storage strategy based
on rememberMe value) is a follow-up task.

[vercel]

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