complete editor panel reorganisation polish

- fix Site tab not loading theme state on direct URL navigation
- fix nav editor showing "Custom URL" for page links (detect by URL match)
- add Home option to nav page picker
- mark editor-reorganisation plan as complete
- add dynamic-url-customisation and draft-publish-workflow plans

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

assets/css/admin/components.css

@@ -561,6 +561,16 @@
   }
 }
 
+.admin-input-disabled,
+.admin-input:disabled,
+.admin-select:disabled,
+.admin-textarea:disabled {
+  background-color: var(--t-surface-muted, var(--t-surface-base));
+  color: var(--t-text-muted);
+  cursor: not-allowed;
+  opacity: 0.7;
+}
+
 .admin-checkbox {
   width: 1rem;
   height: 1rem;