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/residential/residential-clients-list.tsx

@@ -129,11 +129,11 @@ export function ResidentialClientsList() {
                     {c.fullName}
                   </Link>
                 </td>
-                <td className="px-3 py-2 text-muted-foreground">{c.email ?? '—'}</td>
-                <td className="px-3 py-2 text-muted-foreground">{c.phone ?? '—'}</td>
-                <td className="px-3 py-2 text-muted-foreground">{c.placeOfResidence ?? '—'}</td>
+                <td className="px-3 py-2 text-muted-foreground">{c.email ?? '-'}</td>
+                <td className="px-3 py-2 text-muted-foreground">{c.phone ?? '-'}</td>
+                <td className="px-3 py-2 text-muted-foreground">{c.placeOfResidence ?? '-'}</td>
                 <td className="px-3 py-2">{STATUS_LABELS[c.status] ?? c.status}</td>
-                <td className="px-3 py-2 capitalize text-muted-foreground">{c.source ?? '—'}</td>
+                <td className="px-3 py-2 capitalize text-muted-foreground">{c.source ?? '-'}</td>
               </tr>
             ))}
           </tbody>
@@ -323,7 +323,7 @@ function NewResidentialClientSheet({
                 value={residenceCountry}
                 onChange={(iso) => {
                   setResidenceCountry(iso);
-                  // Wipe subdivision when country flips — codes are scoped per country.
+                  // Wipe subdivision when country flips - codes are scoped per country.
                   setResidenceSubdivision(null);
                 }}
                 data-testid="rc-residence-country"