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/middleware.ts

@@ -20,6 +20,11 @@ const PUBLIC_PATHS: string[] = [
 ];
 
 function isPublicPath(pathname: string): boolean {
+  // Per-port PWA manifests sit under `/<portSlug>/scan/manifest.webmanifest`
+  // and need to be fetchable without a session - browsers fetch them eagerly
+  // during install / first paint. The manifest only contains port name +
+  // icon paths, no sensitive data, so making it public is safe.
+  if (pathname.endsWith('/scan/manifest.webmanifest')) return true;
   return PUBLIC_PATHS.some((prefix) => pathname === prefix || pathname.startsWith(prefix));
 }
 
@@ -39,7 +44,7 @@ export function middleware(request: NextRequest): NextResponse {
 
   if (!sessionToken?.value) {
     if (isApiRoute(pathname)) {
-      // API routes return 401 JSON — never redirect
+      // API routes return 401 JSON - never redirect
       return NextResponse.json({ error: 'Authentication required' }, { status: 401 });
     }