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/components/shared/country-combobox.tsx

@@ -141,7 +141,7 @@ export function CountryCombobox({
               {options.map((opt) => (
                 <CommandItem
                   key={opt.code}
-                  // cmdk filters by `value` — include both code + name.
+                  // cmdk filters by `value` - include both code + name.
                   value={`${opt.name} ${opt.code}`}
                   onSelect={() => {
                     onChange(opt.code);