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/alerts/alert-bell.tsx

@@ -16,8 +16,8 @@ import { useAlertCount, useAlertList, useAlertRealtime } from './use-alerts';
 export function AlertBell() {
   const portSlug = useUIStore((s) => s.currentPortSlug);
   const [open, setOpen] = useState(false);
-  // Count is cheap (one aggregate query) — fire on every page so the badge stays live.
-  // List is heavier — only fetch when the popover is actually open.
+  // Count is cheap (one aggregate query) - fire on every page so the badge stays live.
+  // List is heavier - only fetch when the popover is actually open.
   const { data: count } = useAlertCount();
   const { data: list, isLoading } = useAlertList('open', open);
   useAlertRealtime();