🎨 Palette: Implement password visibility toggle in auth forms

[Woschj]

Implemented a global password visibility toggle for all authentication forms.

💡 What:

• Added window.togglePasswordVisibility in base.html.
• Updated login.html, profile.html, and reset_password_confirm.html to use the toggle.
• Added proper id/for attributes to labels in profile.html.

🎯 Why:

• Users often misspell passwords and have no way to verify them before submission.
• Standardizes the password field behavior across the application.
• Improves accessibility for screen reader users by fixing label associations.

♿ Accessibility:

• Added dynamic aria-label and title to the toggle buttons.
• Fixed label-input association in profile.html.
• Used semantic <button type="button"> for the toggle.

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PR created automatically by Jules for task 6234765077014339400 started by @Woschj

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