fix(menu-service): sort extensions by priority first, append shortcuts after

[roncodes]

Problem

getHeaderMenuItems() was using a flat sortBy('priority') across all items, including shortcuts. Shortcuts are assigned priority = parentPriority + 1, so a Fleet-Ops shortcut (priority 2) would sort between Fleet-Ops (priority 1) and Pallet (priority 2), interleaving shortcuts with real extensions.

The smart-nav-menu component builds the default pinned bar by slicing the first maxVisible (5) items from this list, so the bar ended up showing Fleet-Ops + its 4 shortcuts instead of the first 5 extensions.

Fix

Filter items into two groups before sorting — extensions sort by priority as before, shortcuts are appended at the end in registration order:

const extensions = A(items).filter((i) => !i._isShortcut).sortBy('priority');
const shortcuts = A(items).filter((i) => i._isShortcut);
return A([...extensions, ...shortcuts]);

This guarantees shortcuts never displace real extensions from the default bar, regardless of what priority values extensions choose.