style: simplify button labels (drop emoji, keep text)

- 🪄 AI 智能编辑 → AI
- 🚀 发送 → 发送
- ✕ 取消 → 取消

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/components/opencode_cell_actions.ts

@@ -88,7 +88,7 @@ export class OpenCodeCellActions extends Widget {
 
     const btn = document.createElement('button');
     btn.className = 'opencode-btn opencode-btn-ai';
-    btn.textContent = '🪄 AI 智能编辑';
+    btn.textContent = 'AI';
     btn.disabled = baseDisabled;
     btn.title = baseDisabled
       ? 'OpenCode: 等待 cell 上下文…'

src/components/opencode_inline_prompt.ts

@@ -52,7 +52,7 @@ export class OpenCodeInlinePrompt extends Widget {
     this._textarea.rows = 3;
     this._sendBtn = document.createElement('button');
     this._sendBtn.className = 'opencode-btn-send';
-    this._sendBtn.textContent = '🚀 发送';
+    this._sendBtn.textContent = '发送';
     this._sendBtn.disabled = options.disabled;
     this._sendBtn.addEventListener('click', () => {
       const text = this._textarea.value;
@@ -64,7 +64,7 @@ export class OpenCodeInlinePrompt extends Widget {
     });
     this._cancelBtn = document.createElement('button');
     this._cancelBtn.className = 'opencode-btn-cancel';
-    this._cancelBtn.textContent = '✕ 取消';
+    this._cancelBtn.textContent = '取消';
     this._cancelBtn.addEventListener('click', () => {
       options.onCancel();
     });