Sunnyl75

Add background image support with modding fallback and UI toggle

1

This PR adds support for an optional background image on the map canvas. ### Features: - Background image loads via the existing texture/modding system - User can toggle background image...

Token Manager (Qt6): default checkboxes unchecked; token size 32px

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Updates Token Manager to Qt 6. Sets checkboxes default to unchecked and tokenSizeComboBox default to 32 px. Built and validated in alt CI; identical commits here. ## Summary by Sourcery...