调整首页模型选择器位置至发送按钮旁

将首页模型选择入口从左侧移到发送按钮右边（同一行居右），与项目右侧对话的模型选择布局保持一致

上传按钮仍留在左侧，模型选择器与发送按钮组成右侧操作区

apps/ai-game-creator-shell/src/view/home/index.tsx

@@ -243,30 +243,32 @@ export default function HomeView({
             <div className="grid grid-cols-[1fr_auto] items-center gap-2.5 text-[12px] text-(--platform-text-soft)">
               <div className="flex min-w-0 items-center gap-1.5">
                 <UploadButton />
+              </div>
+              <div className="flex shrink-0 items-center gap-1.5">
                 <ConversationModelSelect
                   className="home-input-model-select"
                   disabled={homeCreationBusy}
                   lazy
                 />
+                <button
+                  className="grid size-7 cursor-pointer place-items-center rounded-full border-0 bg-(image:--platform-button-primary-fill) p-0 text-(--platform-button-primary-text) shadow-(--platform-profile-action-shadow) transition-transform hover:scale-105 disabled:cursor-not-allowed disabled:opacity-55"
+                  type="submit"
+                  aria-label={
+                    startMode === 'planning' ? '进入立项策划' : '开启创作'
+                  }
+                  disabled={homeCreationBusy}
+                >
+                  {homeCreationBusy ? (
+                    <Loader2
+                      size={16}
+                      aria-hidden="true"
+                      className="animate-spin"
+                    />
+                  ) : (
+                    <ArrowUp size={16} aria-hidden="true" />
+                  )}
+                </button>
               </div>
-              <button
-                className="grid size-7 cursor-pointer place-items-center rounded-full border-0 bg-(image:--platform-button-primary-fill) p-0 text-(--platform-button-primary-text) shadow-(--platform-profile-action-shadow) transition-transform hover:scale-105 disabled:cursor-not-allowed disabled:opacity-55"
-                type="submit"
-                aria-label={
-                  startMode === 'planning' ? '进入立项策划' : '开启创作'
-                }
-                disabled={homeCreationBusy}
-              >
-                {homeCreationBusy ? (
-                  <Loader2
-                    size={16}
-                    aria-hidden="true"
-                    className="animate-spin"
-                  />
-                ) : (
-                  <ArrowUp size={16} aria-hidden="true" />
-                )}
-              </button>
             </div>
           </RichInputArea>
         </form>