ux: Enter sends, Shift+Enter for newline (was Cmd/Ctrl+Enter to send). Also guards against IME composition with isComposing.

Author: JoshuaPubNub

index.html

@@ -36,7 +36,7 @@ <h1>Gemma <span class="sub">on a 5090</span></h1>
         <div id="messages"></div>
         <form id="composer">
           <div id="imagePreview" class="image-preview"></div>
-          <textarea id="prompt" placeholder="ask Gemma…  paste/drop images, ⌘/ctrl+Enter to send" rows="3"></textarea>
+          <textarea id="prompt" placeholder="ask Gemma…  paste/drop images, Enter to send (Shift+Enter for newline)" rows="3"></textarea>
           <div class="composer-row">
             <button id="attach" type="button" title="attach image">📎 image</button>
             <input id="fileInput" type="file" accept="image/*" multiple hidden />

src/main.js

@@ -327,7 +327,7 @@ els.newChat.addEventListener('click', newConversation);
 els.prompt.addEventListener('input', updateSendEnabled);
 
 els.prompt.addEventListener('keydown', (e) => {
-  if ((e.metaKey || e.ctrlKey) && e.key === 'Enter') {
+  if (e.key === 'Enter' && !e.shiftKey && !e.isComposing) {
     e.preventDefault();
     els.composer.requestSubmit();
   }