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/companies/company-owned-yachts-tab.tsx

@@ -49,13 +49,13 @@ const STATUS_LABELS: Record<string, string> = {
 
 function formatDimensions(y: OwnedYachtRow): string | null {
   if (y.lengthFt || y.widthFt) {
-    const length = y.lengthFt ?? '—';
-    const width = y.widthFt ?? '—';
+    const length = y.lengthFt ?? '-';
+    const width = y.widthFt ?? '-';
     return `${length} × ${width} ft`;
   }
   if (y.lengthM || y.widthM) {
-    const length = y.lengthM ?? '—';
-    const width = y.widthM ?? '—';
+    const length = y.lengthM ?? '-';
+    const width = y.widthM ?? '-';
     return `${length} × ${width} m`;
   }
   return null;
@@ -129,14 +129,14 @@ export function CompanyOwnedYachtsTab({ companyId, portSlug }: CompanyOwnedYacht
                   {dims ? (
                     <span className="text-sm">{dims}</span>
                   ) : (
-                    <span className="text-muted-foreground">—</span>
+                    <span className="text-muted-foreground">-</span>
                   )}
                 </TableCell>
                 <TableCell>
                   {y.hullNumber ? (
                     <span className="text-sm">{y.hullNumber}</span>
                   ) : (
-                    <span className="text-muted-foreground">—</span>
+                    <span className="text-muted-foreground">-</span>
                   )}
                 </TableCell>
                 <TableCell>