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/companies/add-membership-dialog.tsx

@@ -122,7 +122,7 @@ export function AddMembershipDialog({ open, onOpenChange, companyId }: AddMember
     },
     onError: (err: unknown) => {
       let msg = err instanceof Error ? err.message : 'Failed to add membership';
-      // Detect 409 — service returns a "membership already exists" message
+      // Detect 409 - service returns a "membership already exists" message
       if (/already exists/i.test(msg)) {
         msg = 'This membership already exists (same client + role + start date).';
       }