Admin User Moderation and Auth UX Hardening

Added admin ban and unban operations, plus stronger auth and settings testability updates.

This release focuses on operational control and authentication flow quality.

What changed

Added admin user ban and unban functionality.
Added supporting design spec documentation for user moderation.
Improved auth and settings testability with additional data-testid coverage.
Refined redirect handling and type safety in auth-related flows.
Optimized changelog timeline layout alignment and restored sticky date behavior.

91260b7 feat(admin-users): implement user ban and unban functionality
e29f9b1 docs(spec): add admin user ban design
45bf4ef feat(two-factor-auth): enhance TwoFactorVerifyForm with data-testid attributes for improved testability
d655ee4 feat(password-input): refactor PasswordInput component to use forwardRef and improve type safety
91be374 feat(settings): add data-testid attributes for improved testability in confirmation and delete account components
e470adb refactor(auth): streamline redirect handling and enhance type safety