{{-- Shared flash-message toasts — included once in master/guest layouts, never per-page. Positioned with plain "left"/"top" (not Bootstrap's .end-0/.start-0 utilities — those compile to physical right/left and aren't RTL-aware without an RTLCSS build, so .end-0 was actually pinning to the right and overlapping the sidebar). top: 6rem clears the sticky navbar instead of sitting underneath it at top: 0. --}}