feat: default port 443 for domain remotes, strip from display (v0.9.4)

- Domain-like --remote endpoints default to port 443; :443 is optional
- _normalize_endpoint strips :443 before storage in remotes.json
- _load_remotes normalises keys on load (backward compat migration)
- _remote_display_name omits :443 for domain endpoints
- _resolve_connect_endpoint adds :443 back for TCP connection

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

extension/manifest.json

@@ -1,7 +1,7 @@
 {
   "manifest_version": 3,
   "name": "browser-cli",
-  "version": "0.9.2",
+  "version": "0.9.4",
   "description": "Control your browser from the terminal via browser-cli",
   "permissions": [
     "tabs",