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/clients/client-form.tsx

@@ -150,7 +150,7 @@ export function ClientForm({ open, onOpenChange, client, onUseExistingClient }:
         </SheetHeader>
 
         <form onSubmit={handleSubmit((data) => mutation.mutate(data))} className="space-y-6 py-6">
-          {/* Dedup suggestion — only on the create path. Watches the
+          {/* Dedup suggestion - only on the create path. Watches the
               live form values for email / phone / name and surfaces
               an existing client when one matches. The user can
               attach the new interest to that client instead of