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/validators/residential.ts

@@ -81,7 +81,7 @@ export const listResidentialInterestsSchema = baseListQuerySchema.extend({
  * Shape posted by the public website's residential interest form. Coerces
  * to internal create-shapes inside the public route.
  *
- * The legacy `phone` field stays free-text — older website builds may post
+ * The legacy `phone` field stays free-text - older website builds may post
  * raw international strings ('+44 7700 900123'). The route handler parses
  * it server-side into `phoneE164` + `phoneCountry`. Newer website builds
  * can post normalized values directly.