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/users.ts

@@ -144,7 +144,7 @@ export type UserPreferences = {
 
 /**
  * Core user table managed by Better Auth.
- * Do NOT modify directly — Better Auth handles CRUD via its adapter.
+ * Do NOT modify directly - Better Auth handles CRUD via its adapter.
  */
 export const user = pgTable('user', {
   id: text('id').primaryKey(),
@@ -282,7 +282,7 @@ export const userPortRoles = pgTable(
 );
 
 /**
- * Sessions table — Better Auth compatibility.
+ * Sessions table - Better Auth compatibility.
  * Better Auth manages session creation/validation.
  */
 export const session = pgTable(