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/providers/port-provider.tsx

@@ -34,7 +34,7 @@ export function PortProvider({ children, ports, defaultPortId }: PortProviderPro
   const currentPortId = useUIStore((s) => s.currentPortId);
   const currentPortSlug = useUIStore((s) => s.currentPortSlug);
 
-  // Resolve current port — URL slug takes priority over stored port
+  // Resolve current port - URL slug takes priority over stored port
   const currentPort =
     ports.find((p) => p.slug === portSlugFromUrl) ??
     ports.find((p) => p.id === currentPortId) ??