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/files.ts

@@ -231,7 +231,7 @@ export async function listFiles(portId: string, query: ListFilesInput) {
     sort: sort ? { column: sortColumn, direction: order } : undefined,
     page,
     pageSize: limit,
-    // no archivedAtColumn — files are immutable records
+    // no archivedAtColumn - files are immutable records
   });
 }