Bug fixes and improvements

Fixed an error when dragging rounding and margin handles on speech bubble shapes.

Fixed an issue that caused theme colors and styles to not be created on document import.

Improved advanced locking reliability.

Importing PDF documents will add the document as a new page.

Prompt will no longer show when deleting a single repeating object.

Fixed sign-in overlapping text on smaller screens.

Fixed a crash when deleting and re-adding text.

Fixed an issue that caused UI to shift out of view.

Fixed a crash when shift + backspacing in text repeatedly.

Minor UI and UX improvements.

Selection handling improvements.

Server reliability fixes.