chore(style): codebase em-dash sweep + minor layout polish

Replaces every em-dash and en-dash with regular ASCII hyphens
across comments, JSX strings, and dev-facing logs. Mostly cosmetic
but stops the inconsistent mix that crept in over the last few
months (some files used em-dashes in comments, others didn't,
some used both).

Bundles two small dashboard-layout tweaks that touch a couple of
already-modified files:
- (dashboard)/layout.tsx main padding goes from p-6 to pt-3 px-6
  pb-6 so page content sits closer to the topbar.
- Sidebar now receives the ports list it needs for the footer
  port switcher.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/components/admin/roles/role-list.tsx

@@ -95,7 +95,7 @@ export function RoleList() {
       accessorKey: 'description',
       header: 'Description',
       cell: ({ row }) => (
-        <span className="text-muted-foreground text-sm">{row.original.description ?? '—'}</span>
+        <span className="text-muted-foreground text-sm">{row.original.description ?? '-'}</span>
       ),
     },
     {