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/clients/client-companies-tab.tsx

@@ -33,7 +33,7 @@ interface ClientCompaniesTabProps {
 
 function formatSince(startDate: string | Date): string {
   const d = typeof startDate === 'string' ? new Date(startDate) : startDate;
-  if (Number.isNaN(d.getTime())) return '—';
+  if (Number.isNaN(d.getTime())) return '-';
   return format(d, 'MMM d, yyyy');
 }
 
@@ -87,7 +87,7 @@ export function ClientCompaniesTab({ clientId: _clientId, companies }: ClientCom
                       Primary
                     </Badge>
                   ) : (
-                    <span className="text-muted-foreground">—</span>
+                    <span className="text-muted-foreground">-</span>
                   )}
                 </TableCell>
                 <TableCell className="text-muted-foreground text-sm">