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/yachts/yacht-tabs.tsx

@@ -190,7 +190,7 @@ function OverviewTab({ yachtId, yacht }: { yachtId: string; yacht: YachtTabsYach
           variant="textarea"
           value={yacht.notes}
           onSave={save('notes')}
-          emptyText="No notes — click to add"
+          emptyText="No notes - click to add"
         />
       </div>
 
@@ -238,7 +238,7 @@ function YachtInterestsTab({ yachtId }: { yachtId: string }) {
           <span className="w-36 shrink-0 text-xs font-medium uppercase text-muted-foreground">
             {i.pipelineStage.replace(/_/g, ' ')}
           </span>
-          <span className="flex-1 truncate">{i.clientName ?? '—'}</span>
+          <span className="flex-1 truncate">{i.clientName ?? '-'}</span>
           {i.berthMooringNumber && (
             <span className="shrink-0 text-xs text-muted-foreground">
               Berth {i.berthMooringNumber}