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/email/index.ts

@@ -96,7 +96,7 @@ async function resolveAttachments(
  * Sends a single email via SMTP.
  *
  * Returns the nodemailer info object on success. Propagates errors to the
- * caller — callers in background jobs should wrap in try/catch and handle
+ * caller - callers in background jobs should wrap in try/catch and handle
  * retries via BullMQ.
  */
 export async function sendEmail(