Fix signup regex

[joanagmaia]

Changes proposed ✍️

(?=.*[A-Za-z]): This is a positive lookahead, which asserts that at least one alphabetical character (either lowercase or uppercase) must be present somewhere in the string.

(?=.*\d): This is another positive lookahead, which asserts that at least one digit (0-9) must be present somewhere in the string.

(?=.*[^A-Za-z\d]): This is yet another positive lookahead. Here, [^A-Za-z\d] corresponds to any character that is NOT a number or a letter. This assertion ensures that the password includes at least one such symbol.

([^ \t]{8,}): This part defines what exactly we accept within the password. [^ \t] means any character that is NOT a space or a tab. {8,} makes sure that the password string's length is at least 8 characters.

What

🤖[deprecated] Generated by Copilot at dd7247b

Updated password regex in both backend and frontend to enforce a new password policy. The policy aims to improve security by requiring more complex passwords.
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🤖[deprecated] Generated by Copilot at dd7247b

password must change
no spaces, one symbol, please
autumn of old rules

Why

How

🤖[deprecated] Generated by Copilot at dd7247b

• Update password regex to match new policy (link, link)

Checklist ✅

• Label appropriately with Feature, Improvement, or Bug.
• Add screenshots to the PR description for relevant FE changes
• New backend functionality has been unit-tested.
• API documentation has been updated (if necessary) (see docs on API documentation).
• Quality standards are met.