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/admin/ocr-settings/test/route.ts

@@ -13,7 +13,7 @@ const schema = z.object({
   apiKey: z.string().min(1),
 });
 
-// `manage_settings`-gated for parity with the parent OCR settings route —
+// `manage_settings`-gated for parity with the parent OCR settings route -
 // triggers outbound AI provider auth requests using a caller-supplied key.
 export const POST = withAuth(
   withPermission('admin', 'manage_settings', async (req) => {