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) ??

src/providers/socket-provider.tsx

@@ -14,7 +14,7 @@ import { useSession } from '@/lib/auth/client';
 import { usePortStore } from '@/stores/ui-store';
 
 interface SocketContextValue {
-  /** Stable socket instance reference. Persists across reconnects — socket.io's
+  /** Stable socket instance reference. Persists across reconnects - socket.io's
    *  built-in reconnection re-establishes the underlying transport without
    *  changing the JS object, so this stays valid as long as the session and
    *  port are unchanged. Consumers should NOT null-check this for "is online";
@@ -30,7 +30,7 @@ const SocketContext = createContext<SocketContextValue>({ socket: null, isConnec
 
 /** Returns true once the component has mounted on the client. Avoids calling
  *  better-auth's `useSession()` (which dispatches React hooks via nanostores)
- *  during the SSR pass — that combo throws "Invalid hook call" intermittently
+ *  during the SSR pass - that combo throws "Invalid hook call" intermittently
  *  in Next.js 15 dev mode. */
 function useHasMounted(): boolean {
   return useSyncExternalStore(