Merge #456: Wrap saved story revision counters consistently

Conflict: crates/doc/src/edit.rs: next's thread_frames (append_story); every rev += 1 is rev.wrapping_add(1)
Conflict: crates/engine/src/cmd/fonts.rs: next's replace (the local-formatting pass moved out of this hunk)
Conflict: crates/engine/src/cmd/text.rs: next's format_chars (apply_char_attrs, typing format); rev += 1 is rev.wrapping_add(1)

crates/engine/src/cmd/table.rs

@@ -1363,7 +1363,7 @@ fn reapply_cell_styles(d: &mut Document, names: &[String]) {
                 }
             }
         }
-        st.rev += 1;
+        st.rev = st.rev.wrapping_add(1);
     }
 }
 
@@ -1488,7 +1488,7 @@ fn table_style_edit(s: &mut Session, p: &Value) -> Result<Value> {
                     ts.apply_to(std::sync::Arc::make_mut(t), &cells);
                 }
             }
-            st.rev += 1;
+            st.rev = st.rev.wrapping_add(1);
         }
         ok()
     })