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/queue/workers/import.ts

@@ -11,7 +11,7 @@ export const importWorker = new Worker(
     // TODO(L2): implement import job handlers
     //   - CSV client import
     //   - Excel berth spec import
-    //   - Note: maxAttempts=1 — imports are idempotent, user retries manually
+    //   - Note: maxAttempts=1 - imports are idempotent, user retries manually
   },
   {
     connection: { url: process.env.REDIS_URL! } as ConnectionOptions,