Model page: Registry panel lists registry files, elements inside each

- one collapsible header per .archify-registry file with its element
  count and an Open button that opens the registry view; files start
  collapsed, the Registry panel open
- view types moved to views/viewTypes.ts so the diagram page can open a
  registry without a circular import
- 0.7.1

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "archify-vscode-ext",
-  "version": "0.7.0",
+  "version": "0.7.1",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "archify-vscode-ext",
-      "version": "0.7.0",
+      "version": "0.7.1",
       "license": "MIT",
       "dependencies": {
         "three": "^0.186.1",