Introduced `_isPageReady` state to manage page readiness and conditionally render the PDF upload button. Disabled the upload functionality and added a loading spinner when the page is not ready. Updated `OnPdfFileSelectedAsync` to prevent uploads before readiness.
Modified the "No Document Loaded" section to use `_isPageReady` for conditional rendering. Added `SENDER_SAVE_EDIT_MIGRATION_PLAN.md` to the solution. Improved user experience with better feedback during loading states.
TekH
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