Day sheet dialogs (disapprove, justify): moved the async controller call
inside each dialog so loading state is owned there — button shows a
spinner and is disabled while the RPC is in flight; errors display inline
instead of via a snackbar after dialog close.
Detail screen (approve): added _approvingSheet bool; Approve button shows
CircularProgressIndicator while in flight. On success shows an AlertDialog
"Sheet Approved" with a check icon instead of silently updating state.
Approvals tab (bulk approve): upgraded post-approve feedback from a
snackbar to a success AlertDialog showing the count of approved sheets
and any skipped ones.
Day sheets tab (submit): added confirmation AlertDialog before the
existing submit flow so programmers don't accidentally submit mid-day.
Co-Authored-By: claude-flow <ruv@ruv.net>
redz1029
88848138d9