fix: 恢复 AGC 输入区模型名称显示

- 模型选择设置稳定最小宽度，避免被右侧 flex 压缩

- 提高模型名称文字对比度

- 固定 @ 和发送按钮宽度，保持控制行布局稳定

apps/ai-game-creator-shell/src/styles.css

@@ -9118,6 +9118,7 @@ iframe.preview-frame {
   .project-supervisor-surface.is-direct-codex
   .project-supervisor-composer.is-direct-codex
   .project-supervisor-composer-controls-right {
+  flex: 1 1 auto;
   margin-left: auto;
 }
 
@@ -9126,10 +9127,32 @@ iframe.preview-frame {
   .project-supervisor-composer.is-direct-codex
   .project-supervisor-composer-controls
   .conversation-model-select {
+  flex: 1 1 auto;
+  min-width: 96px;
   position: static !important;
   right: auto !important;
   bottom: auto !important;
-  max-width: min(220px, 40%);
+  max-width: min(220px, 50%);
+}
+
+.game-workbench-chat
+  .project-supervisor-surface.is-direct-codex
+  .project-supervisor-composer.is-direct-codex
+  .project-supervisor-composer-controls
+  .conversation-model-trigger {
+  flex: 1 1 auto;
+  min-width: 0;
+  max-width: 100%;
+  color: var(--platform-text-base) !important;
+}
+
+.game-workbench-chat
+  .project-supervisor-surface.is-direct-codex
+  .project-supervisor-composer.is-direct-codex
+  .project-supervisor-composer-controls
+  .conversation-model-trigger-label {
+  flex: 1 1 auto;
+  min-width: 0;
 }
 
 .game-workbench-chat
@@ -9153,6 +9176,7 @@ iframe.preview-frame {
   padding: 0;
   border: 0;
   border-radius: 9px;
+  flex: 0 0 30px;
   place-items: center;
 }