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/dedup/phone-parse.ts

@@ -12,7 +12,7 @@
  * Same surface as the i18n helper; usable from both runtimes.
  *
  * Used by the dedup library's `normalizePhone`. The runtime UI still
- * imports `i18n/phone` directly — no reason to touch a working path.
+ * imports `i18n/phone` directly - no reason to touch a working path.
  */
 
 // eslint-disable-next-line @typescript-eslint/no-require-imports