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/reservations/berth-reserve-dialog.tsx

@@ -147,7 +147,7 @@ export function BerthReserveDialog({ open, onOpenChange, berthId }: BerthReserve
       const msg = err instanceof Error ? err.message : 'Failed to activate';
       if (/active reservation|conflict|409/i.test(msg)) {
         setFormError(
-          'This berth already has an active reservation. The pending record was created — activate it manually once the other reservation ends.',
+          'This berth already has an active reservation. The pending record was created - activate it manually once the other reservation ends.',
         );
       } else {
         setFormError(msg);

src/components/reservations/reservation-list.tsx

@@ -208,7 +208,7 @@ export function ReservationList({
                     View contract
                   </button>
                 ) : (
-                  '—'
+                  '-'
                 )}
               </TableCell>
             </TableRow>