feat: add password strength meter

[saurabhhhcodes]

Adds a live password strength meter to the registration form so users get immediate feedback while they type a new password.

What changed:

• added a compact strength bar and label under the password field
• score the password on length, uppercase, lowercase, number, and special character checks
• update the meter in real time with weak, medium, and strong states

Validation:

• checked the rendered markup for the strength meter hooks
• git diff --check

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