fix(menus): apply the one-rule grouping to the folder context menu

The folder row menu kept a separator at its canEdit permission boundary
plus one before Delete — the same shape already corrected in the file
row menu, missed because the sweep that found it did not cover this
file. Open and Pin above are unconditional, so the surviving rule is
always backed on both sides.

Also records the standing exception the sweep surfaced: the text editor,
terminal, and browser page menus emulate native OS menus, whose banding
the user learns outside Sim. That is the ordering rule's own principle —
mirror the surface they already read — so those keep their banding while
our own resource and row menus, whose toolbars are flat, take one rule.

Author: waleedlatif1

.claude/rules/sim-list-ordering.md

@@ -59,6 +59,15 @@ genuinely buys is a stop before the action you cannot undo.
 A second rule is justified only when a menu mixes genuinely different *scopes* — cell-level and
 table-level actions in one menu, say — not different verbs.
 
+**The one standing exception: menus that emulate a native menu.** The text-editor menu
+(`editor-context-menu.tsx`), the terminal menu (`terminal-context-menu.tsx`), and the browser
+page menu (`browser-session.tsx`) each mirror the OS menu the user already knows — clipboard
+banding (`Cut · Copy · Paste │ Select all`) is a convention every text field on their machine
+teaches them. These keep their native banding, and that is the *same* principle as the ordering
+rule above: mirror the surface the user already reads. The test is whether a real menu outside
+Sim taught them the grouping. Our own resource, row, and action menus have no such precedent —
+the toolbars they mirror are flat — so they take the single rule.
+
 **Both sides of every rule must be guaranteed non-empty.** Write the separator's guard out of
 the *exact* render conditions of the items around it, never a looser approximation:
 

apps/sim/app/workspace/[workspaceId]/components/folders/folder-context-menu.tsx

@@ -91,7 +91,6 @@ export const FolderContextMenu = memo(function FolderContextMenu({
         )}
         {canEdit && (
           <>
-            <DropdownMenuSeparator />
             <DropdownMenuItem onSelect={onRename}>
               <Pencil />
               Rename