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/form-factor.ts

@@ -4,7 +4,7 @@ const MOBILE_TOKENS = ['Mobile', 'iPhone', 'iPad', 'Android'] as const;
 
 /**
  * Classify a User-Agent string as 'mobile' or 'desktop'.
- * Defaults to 'desktop' when the UA is missing or unrecognized — the CSS
+ * Defaults to 'desktop' when the UA is missing or unrecognized - the CSS
  * media-query fallback in globals.css handles desktop browsers resized below
  * the lg breakpoint, so a wrong-but-defaultish classification never breaks UX.
  */