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/search.service.ts

@@ -194,7 +194,7 @@ function recentSearchKey(userId: string, portId: string): string {
 }
 
 /**
- * Fire-and-forget — saves a search term to the user's recent searches sorted set.
+ * Fire-and-forget - saves a search term to the user's recent searches sorted set.
  */
 export function saveRecentSearch(userId: string, portId: string, searchTerm: string): void {
   const key = recentSearchKey(userId, portId);
@@ -203,7 +203,7 @@ export function saveRecentSearch(userId: string, portId: string, searchTerm: str
     .then(() => redis.zremrangebyrank(key, 0, -(RECENT_SEARCH_MAX + 1)))
     .then(() => redis.expire(key, RECENT_SEARCH_TTL))
     .catch(() => {
-      // Intentionally swallowed — recent searches are non-critical
+      // Intentionally swallowed - recent searches are non-critical
     });
 }