fix: 二维码对齐内容区域 + 裁剪提示精简

- QR位置改为top:36px right:36px，与内容padding对齐
- doTERRA行和二维码顶端齐平
- 裁剪提示精简为一行

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/src/views/MyDiary.vue

@@ -610,7 +610,7 @@ async function handleUpload(type, event) {
       const isSquare = await checkSquare(base64)
       if (!isSquare) {
         const { showConfirm: confirm } = await import('../composables/useDialog')
-        const ok = await confirm('二维码图片不是正方形，是否自动裁剪为正方形？\n（取中心区域）')
+        const ok = await confirm('图片非正方形，自动裁剪？')
         if (ok) {
           base64 = await cropToSquare(base64)
         }