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/services/email-compose.service.ts

@@ -72,7 +72,7 @@ export async function sendEmail(
     throw new ForbiddenError('Email account does not belong to this port');
   }
 
-  // Decrypt credentials (INTERNAL — never logged or returned)
+  // Decrypt credentials (INTERNAL - never logged or returned)
   const creds = await getDecryptedCredentials(data.accountId);
 
   // Build user-specific SMTP transporter
@@ -133,7 +133,7 @@ export async function sendEmail(
   // to that address and the subject is prefixed so the operator can see
   // who would have received the message. This service builds its OWN
   // transporter (per-account SMTP) so it doesn't go through sendEmail's
-  // redirect — we apply the same logic here.
+  // redirect - we apply the same logic here.
   const requestedTo = data.to.join(', ');
   const requestedCc = data.cc?.join(', ');
   const effectiveTo = env.EMAIL_REDIRECT_TO ?? requestedTo;