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/app/api/v1/search/route.ts

@@ -18,7 +18,7 @@ export const GET = withAuth(async (req: NextRequest, ctx) => {
 
     const results = await search(ctx.portId, q);
 
-    // Fire-and-forget — do not await
+    // Fire-and-forget - do not await
     saveRecentSearch(ctx.userId, ctx.portId, q);
 
     return NextResponse.json(results);