fix: replace selected ranges instead of ignoring visual paste

src/main.rs

@@ -37,7 +37,7 @@ Normal: i/a insert, I/A insert at first nonblank/end, o/O new line
         v characterwise select, V linewise select, p/P paste fragments, Ctrl+k/Ctrl+e clone above/below
         y/d/c/p/P use the system clipboard by default; config.clipboard_mode = \"separate\" isolates it
         Esc keeps only the primary caret
-Visual: motions extend selections, y copy, d/x/Delete cut, c change
+Visual: motions extend selections, y copy, d/x/Delete cut, c change, p/P replace selections
         r<char> replaces every selected grapheme, preserving newlines; one undo action
         I/A insert at each selected line's first nonblank/end
         Ctrl+l split rows, Ctrl+n add occurrence, Ctrl+s skip, Ctrl+a all