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/app/(scanner)/[portSlug]/scan/manifest.webmanifest/route.ts

@@ -15,7 +15,7 @@ export async function GET(_req: Request, { params }: { params: Promise<{ portSlu
   const portName = port?.name ?? 'Port Nimara';
 
   const manifest = {
-    name: `${portName} — Scanner`,
+    name: `${portName} - Scanner`,
     short_name: 'Scanner',
     description: `Capture and submit expense receipts for ${portName}.`,
     start_url: `/${portSlug}/scan`,

src/app/(scanner)/[portSlug]/scan/page.tsx

@@ -3,7 +3,7 @@ import type { Metadata } from 'next';
 import { ScanShell } from '@/components/scan/scan-shell';
 
 export const metadata: Metadata = {
-  title: 'Scan receipt — Port Nimara',
+  title: 'Scan receipt - Port Nimara',
 };
 
 export default function ScanPage() {