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/ready/route.ts

@@ -21,7 +21,7 @@ interface ReadyResponse {
 }
 
 /**
- * Readiness probe — verifies that every backing service this process
+ * Readiness probe - verifies that every backing service this process
  * needs to serve traffic is reachable. A 503 should drop the pod from the
  * load balancer until the next probe succeeds; it should not trigger a
  * pod restart (that's what `/api/health` is for).