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/lib/i18n/timezones.ts

@@ -13,7 +13,7 @@ import type { CountryCode } from './countries';
 
 type TimezoneList = readonly [primary: string, ...alternates: string[]];
 
-// Multi-zone countries — list every IANA zone.
+// Multi-zone countries - list every IANA zone.
 const MULTI_ZONE: Partial<Record<CountryCode, TimezoneList>> = {
   AU: [
     'Australia/Sydney',
@@ -371,7 +371,7 @@ export function isMultiZone(country: CountryCode): boolean {
 }
 
 /**
- * Master IANA timezone list — uses Intl when available (modern browsers
+ * Master IANA timezone list - uses Intl when available (modern browsers
  * + Node 21+). Falls back to a small bundled list when missing.
  */
 export function listAllTimezones(): readonly string[] {
@@ -383,7 +383,7 @@ export function listAllTimezones(): readonly string[] {
       // fall through
     }
   }
-  // Tiny fallback drawn from our country map — covers ~250 entries and
+  // Tiny fallback drawn from our country map - covers ~250 entries and
   // never less than the timezones we'd otherwise reference.
   const set = new Set<string>();
   for (const tz of Object.values(SINGLE_ZONE)) set.add(tz!);