Add playground entry selector

site/decodal-site/src/pages/playground.astro

@@ -9,14 +9,22 @@ import ManualLayout from '../layouts/ManualLayout.astro';
         <p>Virtual files are evaluated in the browser through WebAssembly. Use import paths such as <code>./schemas/service.dcdl</code>.</p>
       </div>
       <div class="playground-actions">
-        <label class="example-picker">
-          <span>Example</span>
-          <select id="example-select" aria-label="Playground example"></select>
-        </label>
-        <button id="load-example" type="button">Load</button>
+        <div class="action-group example-actions">
+          <label class="example-picker">
+            <span>Example</span>
+            <select id="example-select" aria-label="Playground example"></select>
+          </label>
+          <button id="load-example" type="button">Load</button>
+        </div>
+        <div class="action-group run-actions">
+          <button id="format" disabled>Format</button>
+          <label class="entry-picker">
+            <span>Entry</span>
+            <select id="entry-select" aria-label="Entry point file"></select>
+          </label>
+          <button id="run" disabled>Run</button>
+        </div>
         <p id="status" class="status">Loading WASM...</p>
-        <button id="format" disabled>Format</button>
-        <button id="run" disabled>Run</button>
       </div>
     </div>
 

site/decodal-site/src/scripts/playground.js

@@ -20,6 +20,7 @@ const activeFile = document.getElementById('active-file');
 const newFile = document.getElementById('new-file');
 const deleteFile = document.getElementById('delete-file');
 const exampleSelect = document.getElementById('example-select');
+const entrySelect = document.getElementById('entry-select');
 const loadExample = document.getElementById('load-example');
 
 const project = loadProject();
@@ -178,18 +179,32 @@ function setActiveFile(path) {
   }
   project.activePath = normalized;
   setEditorText(project.files[normalized]);
-  activeFile.textContent = normalized === project.entryPath ? `${normalized} (entry)` : normalized;
+  activeFile.textContent = normalized;
   deleteFile.disabled = Object.keys(project.files).length <= 1;
   renderFileTree();
   updateRunLabel();
   saveProject();
 }
 
-function updateRunLabel() {
+function updateEntrySelect() {
+  const paths = Object.keys(project.files).sort();
   const entryPath = project.files[project.entryPath] === undefined ? project.activePath : project.entryPath;
   project.entryPath = entryPath;
-  run.textContent = `Run ${entryPath}`;
-  run.title = `Materialize ${entryPath}`;
+  entrySelect.replaceChildren(
+    ...paths.map((path) => {
+      const option = document.createElement('option');
+      option.value = path;
+      option.textContent = path;
+      return option;
+    }),
+  );
+  entrySelect.value = entryPath;
+}
+
+function updateRunLabel() {
+  updateEntrySelect();
+  run.textContent = 'Run';
+  run.title = `Materialize ${project.entryPath}`;
 }
 
 function execute() {
@@ -247,8 +262,8 @@ function renderTreeList(children) {
       const button = document.createElement('button');
       button.type = 'button';
       button.className = child.path === project.activePath ? 'file active' : 'file';
-      button.textContent = child.path === project.entryPath ? `${child.name} *` : child.name;
-      button.title = child.path === project.entryPath ? `${child.path} (entry point)` : child.path;
+      button.textContent = child.name;
+      button.title = child.path;
       button.addEventListener('click', () => setActiveFile(child.path));
       item.append(button);
     } else {
@@ -277,6 +292,13 @@ try {
   status.textContent = `Failed to load WASM: ${error?.message ?? error}`;
 }
 
+entrySelect.addEventListener('change', () => {
+  const path = normalizePath(entrySelect.value);
+  if (project.files[path] === undefined) return;
+  project.entryPath = path;
+  updateRunLabel();
+  saveProject();
+});
 run.addEventListener('click', execute);
 formatButton.addEventListener('click', formatActiveFile);
 loadExample.addEventListener('click', () => {

site/decodal-site/src/style.css

@@ -293,11 +293,26 @@ main.playground {
   align-items: center;
   display: flex;
   flex-wrap: wrap;
-  gap: 8px;
+  gap: 10px;
   justify-content: flex-end;
 }
 
-.example-picker {
+.action-group {
+  align-items: center;
+  background: rgba(15, 23, 42, 0.55);
+  border: 1px solid var(--border);
+  border-radius: 12px;
+  display: flex;
+  gap: 8px;
+  padding: 6px;
+}
+
+.run-actions {
+  border-color: rgba(96, 165, 250, 0.35);
+}
+
+.example-picker,
+.entry-picker {
   align-items: center;
   color: var(--muted);
   display: flex;
@@ -307,7 +322,8 @@ main.playground {
   text-transform: uppercase;
 }
 
-.example-picker select {
+.example-picker select,
+.entry-picker select {
   background: var(--surface);
   border: 1px solid var(--border);
   border-radius: 8px;
@@ -318,6 +334,10 @@ main.playground {
   text-transform: none;
 }
 
+.entry-picker select {
+  max-width: 220px;
+}
+
 button {
   background: var(--link);
   border: 0;