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-dedup.service.ts

@@ -1,5 +1,5 @@
 /**
- * Expense duplicate detection — heuristic match on
+ * Expense duplicate detection - heuristic match on
  * (port + vendor + amount + date ± 3d). PR1 ships the function shape;
  * PR8 wires the BullMQ trigger and the merge service.
  */
@@ -71,7 +71,7 @@ export async function markBestDuplicate(expenseId: string): Promise<string | nul
 }
 
 /**
- * Clear the duplicate flag — operator confirmed this is a real expense.
+ * Clear the duplicate flag - operator confirmed this is a real expense.
  * Leaves `dedupScannedAt` populated so the engine doesn't re-flag it.
  */
 export async function clearDuplicate(expenseId: string, portId: string): Promise<void> {
@@ -118,7 +118,7 @@ export async function mergeDuplicate(
       .set({ receiptFileIds: mergedReceipts })
       .where(eq(expenses.id, targetId));
 
-    // Archive the source — preserves audit history, keeps any FKs alive.
+    // Archive the source - preserves audit history, keeps any FKs alive.
     await tx
       .update(expenses)
       .set({ archivedAt: sql`now()`, duplicateOf: null })