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/db/schema/migration.ts

@@ -28,7 +28,7 @@ export const migrationSourceLinks = pgTable(
     targetEntityType: text('target_entity_type').notNull(),
     /** UUID of the new-system entity (clients.id, interests.id, etc.). */
     targetEntityId: text('target_entity_id').notNull(),
-    /** Apply-id from the migration run that created this link — pairs with
+    /** Apply-id from the migration run that created this link - pairs with
      *  the on-disk apply manifest so `--rollback --apply-id <id>` knows
      *  exactly which links to remove. */
     appliedId: text('applied_id').notNull(),