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/berths/berth-interests-tab.tsx

@@ -168,7 +168,7 @@ export function BerthInterestsTab({ berthId }: BerthInterestsTabProps) {
                     href={`/${portSlug}/interests/${i.id}` as never}
                     className="hover:text-brand"
                   >
-                    {i.clientName ?? '—'}
+                    {i.clientName ?? '-'}
                   </Link>
                 </td>
                 <td className="px-3 py-2">
@@ -177,10 +177,10 @@ export function BerthInterestsTab({ berthId }: BerthInterestsTabProps) {
                   </Badge>
                 </td>
                 <td className="px-3 py-2 text-muted-foreground">
-                  {i.leadCategory ? (CATEGORY_LABELS[i.leadCategory] ?? i.leadCategory) : '—'}
+                  {i.leadCategory ? (CATEGORY_LABELS[i.leadCategory] ?? i.leadCategory) : '-'}
                 </td>
                 <td className="px-3 py-2 text-muted-foreground">
-                  {i.source ? (SOURCE_LABELS[i.source] ?? i.source) : '—'}
+                  {i.source ? (SOURCE_LABELS[i.source] ?? i.source) : '-'}
                 </td>
                 <td className="px-3 py-2 text-xs text-muted-foreground">
                   {new Date(i.createdAt).toLocaleDateString()}