Update UI and write index.json file

Author: FadhlanR

Diff for: packages/host/app/components/operator-mode/workspace-chooser/add-workspace.gts

@@ -140,11 +140,7 @@ export default class AddWorkspace extends Component<Signature> {
                 @helperText='The endpoint is the unique identifier for your workspace. Use letters, numbers, and hyphens only.'
               />
             </FieldContainer>
-            <FieldContainer
-              @label='Initialize workspace with'
-              @tag='label'
-              class='field'
-            >
+            <FieldContainer @label='Copy from Seed' @tag='label' class='field'>
               <label class='copy-from-seed-label'>
                 <BoxelInput
                   data-test-copy-from-seed-field
@@ -154,7 +150,8 @@ export default class AddWorkspace extends Component<Signature> {
                   @value={{this.copyFromSeedRealm}}
                   @onChange={{this.toggleCopyFromSeedRealm}}
                 />
-                <span>Cards and Fields from Seed Workspace</span>
+                <span>Populate new workspace with sample cards (uncheck for a
+                  blank workspace).</span>
               </label>
             </FieldContainer>
           {{/if}}
@@ -256,8 +253,8 @@ export default class AddWorkspace extends Component<Signature> {
       }
       .copy-from-seed-label {
         display: flex;
-        align-items: center;
         gap: calc(var(--boxel-sp-sm) + 1px);
+        padding-top: var(--boxel-sp-sm);
       }
       .copy-from-seed-label span {
         color: var(--boxel-label-color);
@@ -267,6 +264,7 @@ export default class AddWorkspace extends Component<Signature> {
       .copy-from-seed-label :deep(.input-container) {
         grid-template-columns: 1fr;
         width: auto;
+        height: 100%;
       }
       .copy-from-seed-checkbox {
         --boxel-input-height: 17px;

Diff for: packages/realm-server/server.ts

@@ -337,26 +337,29 @@ export class RealmServer {
       ...(iconURL ? { iconURL } : {}),
       ...(backgroundURL ? { backgroundURL } : {}),
     });
-    if (this.seedPath) {
-      if (copyFromSeedRealm) {
-        let ignoreList = IGNORE_SEED_FILES.map((file) =>
-          join(this.seedPath!.replace(/\/$/, ''), file),
-        );
+    if (this.seedPath && copyFromSeedRealm) {
+      let ignoreList = IGNORE_SEED_FILES.map((file) =>
+        join(this.seedPath!.replace(/\/$/, ''), file),
+      );
 
-        copySync(this.seedPath, realmPath, {
-          filter: (src, _dest) => {
-            return !ignoreList.includes(src);
+      copySync(this.seedPath, realmPath, {
+        filter: (src, _dest) => {
+          return !ignoreList.includes(src);
+        },
+      });
+      this.log.debug(`seed files for new realm ${url} copied to ${realmPath}`);
+    } else {
+      writeJSONSync(join(realmPath, 'index.json'), {
+        data: {
+          type: 'card',
+          meta: {
+            adoptsFrom: {
+              module: 'https://cardstack.com/base/cards-grid',
+              name: 'CardsGrid',
+            },
           },
-        });
-        this.log.debug(
-          `seed files for new realm ${url} copied to ${realmPath}`,
-        );
-      } else {
-        copySync(
-          join(this.seedPath!.replace(/\/$/, ''), 'index.json'),
-          join(realmPath!.replace(/\/$/, ''), 'index.json'),
-        );
-      }
+        },
+      });
     }
 
     let realm = new Realm(