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/users/user-card.tsx

@@ -108,7 +108,7 @@ export function UserCard({ user, onEdit, onRemove, isRemoving }: UserCardProps)
             <span aria-hidden className="block h-9 w-9 shrink-0" />
           </div>
 
-          {/* Email subtitle — only when display name is shown as title */}
+          {/* Email subtitle - only when display name is shown as title */}
           {user.displayName && user.displayName !== user.email ? (
             <p className="mt-0.5 inline-flex items-center gap-1 truncate text-sm text-muted-foreground">
               <Mail className="h-3.5 w-3.5 shrink-0 text-muted-foreground/70" aria-hidden />