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/portal/passwords.ts

@@ -24,7 +24,7 @@ export async function hashPassword(password: string): Promise<string> {
 /**
  * Constant-time check of a candidate password against a stored
  * `salt:keyHex` hash. Returns false on any malformed input rather than
- * throwing — callers should treat false uniformly.
+ * throwing - callers should treat false uniformly.
  */
 export async function verifyPassword(password: string, stored: string): Promise<boolean> {
   const parts = stored.split(':');