v3.5.30

Added startup mode selection so entering the editor now defaults to Marty mode when a Marty is already connected, and sprite mode otherwise.

Fixed Marty side-step block description wiring so martyStepRight/martyStepLeft use Marty-specific left/right description keys (instead of incorrect forward/back behavior caused by previous overrides).

Updated English localization text for Marty side-step descriptions to proper title case and correct direction wording:

BLOCK_DESC_MOVE_MARTY_RIGHT: Move Right
BLOCK_DESC_MOVE_MARTY_LEFT: Move Left

Kept mode stable when adding a new page: creating a page in Marty mode no longer reverts to sprite mode.