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/files/folders/route.ts

@@ -16,7 +16,7 @@ export const POST = withAuth(
     try {
       const body = await parseBody(req, createFolderSchema);
 
-      // Sanitize path — no null bytes, no path traversal
+      // Sanitize path - no null bytes, no path traversal
       const safePath = body.path
         .replace(/\x00/g, '')
         .replace(/\.\.\//g, '')