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/expense-ocr.service.ts

@@ -33,7 +33,7 @@ export interface OcrContext {
 export const OCR_MAX_TOKENS = 1024;
 export const OCR_LOW_CONFIDENCE_THRESHOLD = 0.6;
 
-/** Stub — returns "pending" shape so callers can wire UI in PR1 without
+/** Stub - returns "pending" shape so callers can wire UI in PR1 without
  *  Anthropic credentials. */
 export async function ocrReceipt(_ctx: OcrContext): Promise<OcrResult> {
   return {