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/api/health/route.ts

@@ -1,11 +1,11 @@
 import { NextResponse } from 'next/server';
 
 /**
- * Liveness probe — confirms the Next.js process is responding.
+ * Liveness probe - confirms the Next.js process is responding.
  *
  * Returns 200 unconditionally; if the process is wedged or has crashed
  * the request never lands here at all. Do NOT include database/Redis/MinIO
- * checks in this endpoint — a transient downstream blip should drop the
+ * checks in this endpoint - a transient downstream blip should drop the
  * pod from the load balancer (readiness), not restart the pod (liveness).
  *
  * For deep dependency checks, hit `/api/ready` instead.