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/client-merge.service.ts

@@ -1,9 +1,9 @@
 /**
- * Client merge service — atomically combines two client records.
+ * Client merge service - atomically combines two client records.
  *
  * Used by:
  *   - /admin/duplicates review queue (when an admin confirms a merge)
- *   - the at-create suggestion path ("use existing client") — though
+ *   - the at-create suggestion path ("use existing client") - though
  *     that path uses the lighter `attachInterestToClient` and never
  *     actually merges two pre-existing clients
  *   - the migration script's `--apply` (eventually)
@@ -37,7 +37,7 @@ import { auditLogs } from '@/lib/db/schema/system';
 // ─── Public API ─────────────────────────────────────────────────────────────
 
 export interface MergeFieldChoices {
-  /** Per-field overrides — `winner` keeps the surviving client's value;
+  /** Per-field overrides - `winner` keeps the surviving client's value;
    *  `loser` copies the loser's value over. Fields not listed default
    *  to `winner` (no change). */
   fullName?: 'winner' | 'loser';
@@ -217,7 +217,7 @@ export async function mergeClients(opts: MergeOptions): Promise<MergeResult> {
     for (const c of loserContacts) {
       const key = `${c.channel}::${c.value.toLowerCase()}`;
       if (winnerContactKeys.has(key)) {
-        // Winner already has this contact — drop loser's row (cascade
+        // Winner already has this contact - drop loser's row (cascade
         // will clean up when loser is archived). But we keep snapshot
         // so undo restores it.
         continue;
@@ -264,7 +264,7 @@ export async function mergeClients(opts: MergeOptions): Promise<MergeResult> {
     await tx.delete(clientTags).where(eq(clientTags.clientId, opts.loserId));
 
     // Relationships: rewrite each FK side to point at the winner. Keep
-    // both sides regardless — even if A and B both end up as the same
+    // both sides regardless - even if A and B both end up as the same
     // person, the row is preserved for audit; the UI hides self-loops.
     const movedRelationships =
       (
@@ -305,7 +305,7 @@ export async function mergeClients(opts: MergeOptions): Promise<MergeResult> {
       .where(
         and(
           eq(clientMergeCandidates.portId, winnerRow.portId),
-          // pair stored in canonical order — match either direction
+          // pair stored in canonical order - match either direction
           sql`(
             (${clientMergeCandidates.clientAId} = ${opts.winnerId}
              AND ${clientMergeCandidates.clientBId} = ${opts.loserId})