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/documents/documents-hub.tsx

@@ -180,7 +180,7 @@ export function DocumentsHub({ portSlug, initialTab = 'all' }: DocumentsHubProps
             {isNonSignature && doc.status === 'sent' ? 'Delivered' : doc.status.replace(/_/g, ' ')}
           </StatusPill>
           <span className="text-xs tabular-nums text-muted-foreground">
-            {totalSigners > 0 ? `${signedCount}/${totalSigners} signed` : '—'}
+            {totalSigners > 0 ? `${signedCount}/${totalSigners} signed` : '-'}
           </span>
           <span className="text-xs text-muted-foreground">
             {new Date(doc.createdAt).toLocaleDateString('en-GB')}