feat: refactor block system

Refactored from legacy layouts/partials/blox/* system to:
     - blox/<block-id>/block.html source structure
     - Hugo module mounts to layouts/partials/hbx/blocks/<block-id>/block.html
     - Resolver-based lookup
     - Support for data-driven pages and client islands

hugo-blox-builder.code-workspace

@@ -24,7 +24,8 @@
       "**/pagefind/**": true
     },
     "explorer.excludeGitIgnore": true,
-
+    "workbench.editor.labelFormat": "medium",
+    "breadcrumbs.enabled": true,
     "npm.packageManager": "pnpm",
 
     "editor.formatOnSave": true,