Add Text Capabilities to Structure Section

Description: Allow users to add and edit text in the "Structure" section of Cost Volume Pro (CVP), similar to the existing capabilities in the "Text Editor" section. This feature aims to enhance functionality by providing a consistent text-editing experience across sections, improving usability and flexibility for users

Use Case/Example: Users need the ability to add detailed text explanations, notes, or annotations directly within the "Structure" section of CVP to align with project or proposal requirements. This eliminates the need to switch to the "Text Editor" section, streamlining workflows and improving efficiency.