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-yachts-tab.tsx

@@ -74,9 +74,9 @@ export function ClientYachtsTab({ clientId: _clientId, yachts }: ClientYachtsTab
                     </Link>
                   </TableCell>
                   <TableCell>
-                    {y.lengthFt && y.widthFt ? `${y.lengthFt} × ${y.widthFt} ft` : '—'}
+                    {y.lengthFt && y.widthFt ? `${y.lengthFt} × ${y.widthFt} ft` : '-'}
                   </TableCell>
-                  <TableCell>{y.hullNumber ?? '—'}</TableCell>
+                  <TableCell>{y.hullNumber ?? '-'}</TableCell>
                   <TableCell className="capitalize">{y.status.replace('_', ' ')}</TableCell>
                 </TableRow>
               ))}