Scroll 0.1.5: Refined Story card workflows and sign-in experience

Scroll 0.1.5 refines Story card workflows and the sign-in experience, making content creation and editing more consistent and clear.

What changed

• Unified Story card workflows. Card creation, editing, and management are now more consistent across Story views.
• Improved localization. Card types, templates, properties, and relations now have more complete localized display.
• Improved editing safeguards. Card metadata editing and draft recovery protection have been refined.
• Refined the sign-in interface. Fixed inconsistent backgrounds on the welcome sign-in screen and aligned its visual presentation.