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>