Allow saving without file open (Save as... prompt)

frontend/src/App.vue

@@ -58,8 +58,8 @@
             <button @click="exportHTML" title="Export HTML">HTML</button>
             <button @click="exportMD" title="Download .md">MD</button>
           </div>
-          <button class="save-btn" :class="{dirty: isDirty}" @click="saveFile">
-            {{ isDirty ? 'Save*' : 'Saved' }}
+          <button class="save-btn" :class="{dirty: isDirty || (!currentFile && content)}" @click="saveFile">
+            {{ !currentFile && content ? 'Save as...' : isDirty ? 'Save*' : 'Saved' }}
           </button>
         </div>
       </div>
@@ -308,7 +308,21 @@ async function openFile(path) {
 }
 
 async function saveFile() {
-  if (!currentFile.value) return
+  if (!currentFile.value) {
+    // No file open — prompt to create one
+    const name = prompt('Save as (e.g. notes.md):')
+    if (!name) return
+    let path = name
+    if (!path.endsWith('.md') && !path.endsWith('.txt')) {
+      path += '.md'
+    }
+    await api('/api/files/create', { path, content: content.value })
+    currentFile.value = path
+    isDirty.value = false
+    await loadFiles()
+    setTimeout(checkGitStatus, 1000)
+    return
+  }
   await api('/api/files/write', { path: currentFile.value, content: content.value })
   isDirty.value = false
   setTimeout(checkGitStatus, 1000)