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/notifications.service.ts

@@ -83,7 +83,7 @@ export async function createNotification(
     }
   }
 
-  // 2. Preference check (skip for system_alert type — always delivered)
+  // 2. Preference check (skip for system_alert type - always delivered)
   if (type !== 'system_alert') {
     const [pref] = await db
       .select({
@@ -101,12 +101,12 @@ export async function createNotification(
       .limit(1);
 
     if (pref && pref.inApp === false) {
-      // Check if email is enabled — if neither, skip entirely
+      // Check if email is enabled - if neither, skip entirely
       if (pref.email === false) {
         return null;
       }
       // inApp disabled but email enabled: still enqueue email but skip insert
-      // We can't insert and emit, so just enqueue if there were a row — but we need an ID.
+      // We can't insert and emit, so just enqueue if there were a row - but we need an ID.
       // Per spec: if inApp=false, skip insert. Email requires notificationId so skip email too.
       return null;
     }