Add the create-reservation dialog and its option sources for todo 3 of
ops-reservations-and-crate-sync.
- src/lib/operations/reservationOptions.ts: server-only option pool
(listReservationOptions) returning upcoming unit-visible missions, idle
unreserved vehicles, operational structures, budget accounts (no
balances), per-origin stock, and a capped roster.
- src/components/frontend/operations/reservations/CreateReservationDialog.tsx:
client dialog with core fields, personnel/vehicle multi-picks, cargo
line repeater, budget + expiry; client pre-validation mirrors the
server validator; engine errors render verbatim.
- Mount the dialog on the reservations list page, server-gated by
operation-reservations:create + hasLogisticsQualification.
- Integration tests for the option scopes; e2e spec written (run in F3).
tsc clean; 5/5 integration tests pass.
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