feat: add password strength validation to signup form

[pericharlabindhumadhavi-data]

Closes #20

Problem

The signup form only had required on the password field with no minimum length or complexity rules. A user could sign up with a single character password — a real security concern for a clinical portal handling patient data.

Fix

Added client-side password validation that enforces:

• Minimum 8 characters
• At least one number
• Clear inline error message shown under the password field when rules are violated
• Password field border turns red on invalid input

Files Changed

• src/app/auth/signup/page.tsx

Testing

• Typing a password under 8 chars → shows "Password must be at least 8 characters."
• Typing 8+ chars with no number → shows "Password must contain at least one number."
• Valid password → no error, form submits normally

Screenshots

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