Refine assistant composer anchoring and beta release copy

docs/releases/v1.0-Beta/beta-app-description.md

@@ -0,0 +1,43 @@
+# Beta App Description
+
+## 中文版
+
+`XWorkmate v1.0 Beta` 是一个桌面优先的 AI 工作台，聚焦于助手对话、灵活执行流程和工具接入管理。本次 Beta 主要围绕以下核心能力展开：
+
+1. 助手对话与三种工作模式
+2. 技能导入与管理
+3. LLM API 与网关连接配置
+4. macOS 桌面端整体稳定性、性能与交互体验
+
+欢迎在公开测试期间重点反馈：
+
+- 连接稳定性
+- 任务执行结果
+- UI 细节
+- 性能表现
+- 你希望补齐或优化的工作流能力
+
+建议填写版本：
+
+`XWorkmate v1.0 Beta` 是一个桌面优先的 AI 工作台，聚焦于助手对话、灵活执行流程和工具接入管理。本次 Beta 重点测试助手对话与三种工作模式、技能导入与管理、LLM API 与网关连接配置，以及 macOS 桌面端整体稳定性、性能与交互体验。欢迎重点反馈连接稳定性、任务执行结果、UI 细节、性能表现，以及你希望补齐或优化的工作流能力。
+
+## English Version
+
+`XWorkmate v1.0 Beta` is a desktop-first AI workspace focused on assistant conversations, flexible execution workflows, and connected tool management. This beta is centered on the following core capabilities:
+
+1. Assistant conversations and three working modes
+2. Skill import and management
+3. LLM API setup and gateway connection configuration
+4. Overall macOS desktop stability, performance, and interaction quality
+
+We especially welcome feedback during public testing on:
+
+- Connection stability
+- Task execution results
+- UI details
+- Performance
+- Workflow capabilities you feel are still missing or need improvement
+
+Recommended copy:
+
+`XWorkmate v1.0 Beta` is a desktop-first AI workspace focused on assistant conversations, flexible execution workflows, and connected tool management. This beta highlights assistant conversations with three working modes, skill import and management, LLM API and gateway connection setup, and continued improvements to overall macOS desktop stability, performance, and interaction quality. We especially welcome feedback on connection stability, task execution results, UI details, performance, and any workflow capabilities you feel are still missing or should be improved.

lib/features/assistant/assistant_page.dart

@@ -2982,6 +2982,7 @@ class _ComposerBarState extends State<_ComposerBar> {
     return Padding(
       padding: const EdgeInsets.fromLTRB(10, 8, 10, 0),
       child: Column(
+        mainAxisAlignment: MainAxisAlignment.end,
         crossAxisAlignment: CrossAxisAlignment.start,
         children: [
           Row(

lib/web/web_assistant_page.dart

@@ -1302,6 +1302,7 @@ class _ConversationWorkspace extends StatelessWidget {
                 borderRadius: 10,
                 tone: SurfaceCardTone.chrome,
                 child: Column(
+                  mainAxisAlignment: MainAxisAlignment.end,
                   crossAxisAlignment: CrossAxisAlignment.start,
                   children: [
                     if (attachments.isNotEmpty) ...[