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/invitations/invitations-manager.tsx

@@ -117,7 +117,7 @@ export function InvitationsManager() {
               {invites.map((i) => (
                 <tr key={i.id} className="border-t">
                   <td className="px-3 py-2 font-medium">{i.email}</td>
-                  <td className="px-3 py-2 text-muted-foreground">{i.name ?? '—'}</td>
+                  <td className="px-3 py-2 text-muted-foreground">{i.name ?? '-'}</td>
                   <td className="px-3 py-2 text-muted-foreground">
                     {i.isSuperAdmin ? 'Super admin' : 'Standard user'}
                   </td>
@@ -163,7 +163,7 @@ export function InvitationsManager() {
                         )}
                       </div>
                     ) : (
-                      <span className="text-xs text-muted-foreground">—</span>
+                      <span className="text-xs text-muted-foreground">-</span>
                     )}
                   </td>
                 </tr>