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记忆页把整篇 MEMORY.md 绑在一个 OutlinedTextField(minLines=6, maxLines=12) 上：
Compose 的文本框排版代价随全文线性增长，几十 KiB 文档在进入页面与每次输入时都要
重排整篇。实测表现为「记忆内容为空时不卡，字数一多就非常卡」。
改动：
- 新增 MemoryViewMode { Preview, Edit }，卡片顶部两个文字按钮显式切换
- 默认按内容自动选：有内容先预览，空文档直接进编辑，不额外增加点击
- 预览用 LazyColumn 按行拆条虚拟化，只组合视口内的行；外层同为 LazyColumn，
按 Compose 约束给 heightIn(max) 明确高度上限
- 编辑仍用原 TextField，只有用户主动切到编辑时才承担整篇排版成本
- 文案 memory_view_mode_preview 补齐 en / zh-Hans / zh-Hant
行为差异仅限「默认先看预览」，编辑能力、保存、清空、字节计数与超限提示均未改动。
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问题
记忆页把整篇
MEMORY.md绑在一个OutlinedTextField(minLines = 6, maxLines = 12)上。Compose 文本框的排版代价随全文线性增长，几十 KiB 文档在进入页面和每次输入时都要重排整篇。实测症状：记忆内容为空时不卡，字数一多就非常卡。
改法
MemoryViewMode { Preview, Edit }，卡片顶部两个文字按钮显式切换LazyColumn按行拆条虚拟化，只组合视口内的行；外层同为LazyColumn，按 Compose 约束给heightIn(max = 320.dp)明确高度上限TextField，只有用户主动切到编辑时才承担整篇排版成本memory_view_mode_preview补齐 en / zh-Hans / zh-Hant兼容性
编辑、保存、清空、字节计数、超限提示逻辑均未改动。唯一行为差异是默认先展示预览。
验证
:app:compileDebugKotlin通过（release 构建亦通过）