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/invoices/invoice-card.tsx

@@ -155,7 +155,7 @@ export function InvoiceCard({
             <span className="truncate">{invoice.clientName}</span>
           </p>
 
-          {/* Amount — prominent */}
+          {/* Amount - prominent */}
           <p className="mt-1 text-base font-semibold tabular-nums text-foreground">
             {amountFormatted}
           </p>

src/components/invoices/invoice-detail.tsx

@@ -55,12 +55,12 @@ const PAYMENT_METHOD_OPTIONS: Array<{ value: string; label: string }> = [
 ];
 
 function formatPaymentMethod(method: string | null | undefined): string {
-  if (!method) return '—';
+  if (!method) return '-';
   return PAYMENT_METHOD_LABELS[method] ?? method.replace(/_/g, ' ');
 }
 
 function formatDateOnly(value: string | null | undefined): string {
-  if (!value) return '—';
+  if (!value) return '-';
   // Stored values are typically YYYY-MM-DD or ISO. Treat as date-only to avoid TZ shift.
   const isoDate = value.length === 10 ? value + 'T00:00:00' : value;
   const d = new Date(isoDate);
@@ -299,7 +299,7 @@ export function InvoiceDetail({ invoiceId }: InvoiceDetailProps) {
                   <div>
                     <p className="font-medium">{exp.establishmentName ?? 'Unnamed Expense'}</p>
                     <p className="text-muted-foreground text-xs">
-                      {exp.category ?? '—'} &middot; {exp.expenseDate}
+                      {exp.category ?? '-'} &middot; {exp.expenseDate}
                     </p>
                   </div>
                   <span className="font-medium tabular-nums">
@@ -341,7 +341,7 @@ export function InvoiceDetail({ invoiceId }: InvoiceDetailProps) {
                   </div>
                   <div>
                     <span className="text-muted-foreground">Reference</span>
-                    <p className="mt-0.5">{invoice.paymentReference ?? '—'}</p>
+                    <p className="mt-0.5">{invoice.paymentReference ?? '-'}</p>
                   </div>
                 </div>
               </CardContent>