Add a submitting state to the shift approval flow: include new "submitting" strings in English and Spanish localization files; thread submittingShiftId from ShiftsPage into MyShiftsTab and HistoryShiftsTab and compute per-shift isSubmitting; add isSubmitting prop to ShiftCard and ShiftCardApprovalFooter. When a shift is being submitted the footer shows "SUBMITTING..." and a small CircularProgressIndicator instead of the submit button.
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