docs(web): describe trajectory thumbnail status feedback

Refs #4356

.agents/notes/implemented/bug-fix/2026-09-15-trajectory-attachment-presentation.i18n.yaml

@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write .agents/notes/implemented/bug-fix/2026-09-15-trajectory-attachment-presentation.md
-2026-09-15-trajectory-attachment-presentation.md: 4a1528a230c0ded38d26d0859a181ebaa208180d
-2026-09-15-trajectory-attachment-presentation.zh.md: e6accddb292613d9688b66847b6d6834ad6636c6
+2026-09-15-trajectory-attachment-presentation.md: fdf22a74ed2794cdea08a9c98a0eb384f992c447
+2026-09-15-trajectory-attachment-presentation.zh.md: d7088cd80dcf3eccde2abcccfff3eaaf89393ac2

.agents/notes/implemented/bug-fix/2026-09-15-trajectory-attachment-presentation.md

@@ -17,7 +17,7 @@ Trajectory presents every attachment occurrence while keeping visual inspection
 | Ledger | Separate nonzero image and ordinary-file counts accompany the text excerpt, including messages without text. Each record stays on one compact line. |
 | Summary and Preview | Message text precedes one ordered attachment list. Both tabs use the same renderer; Summary retains its compact spacing and scroll container. |
 | Attachment list | Equal-width compact rows share spacing and corners. A file-type icon or contained image thumbnail accompanies the recorded name and available metadata. Repeated references retain their occurrence order. |
-| Image interaction | The complete image fits inside a 48px square thumbnail without cropping. Activation opens the existing image viewer, with keyboard access, loading feedback, and retry after a failed read. |
+| Image interaction | The complete image fits inside a 48px square thumbnail without cropping. Activation opens the existing image viewer, with keyboard access. Loading and retry icons fit the thumbnail and expose localized tooltips and accessible names. |
 | Raw | Image and file blocks use initially collapsed metadata disclosures with complete recorded fields. Original content-block order and unrendered text remain intact; generated display labels do not enter raw fields. |
 
 Recorded filenames take precedence over localized numbered image labels. Metadata comes from recorded fields or the filename extension; zero-byte sizes remain visible. Visually truncated names retain their complete accessible text and tooltip. Messages without text still expose all attachments inside the inspector's scroll area.

.agents/notes/implemented/bug-fix/2026-09-15-trajectory-attachment-presentation.zh.md

@@ -17,7 +17,7 @@ Trajectory 展示每次附件出现的记录，并分别提供视觉预览与已
 | 列表 | 文本摘要旁分别显示非零的图片数量与普通文件数量，无正文的消息也显示计数。每条记录保持为紧凑单行。 |
 | 概述与预览 | 消息正文之后展示一个有序附件列表。两个标签页使用相同的渲染器；概述保留紧凑间距和滚动容器。 |
 | 附件列表 | 等宽的紧凑行使用一致的间距和圆角。文件类型图标或完整缩放的图片缩略图旁展示已记录的名称与可用元数据。重复引用保留各次出现的顺序。 |
-| 图片交互 | 图片完整缩放到 48px 方形缩略图内，不裁剪。激活时打开现有图片查看器，保留键盘访问、加载反馈和读取失败后的重试。 |
+| 图片交互 | 图片完整缩放到 48px 方形缩略图内，不裁剪。激活时打开现有图片查看器，保留键盘访问。加载与重试图标适配缩略图尺寸，并提供本地化的工具提示和可访问名称。 |
 | 原始内容 | 图片块和文件块使用默认收起的元数据折叠区，包含完整记录字段。原始内容块顺序与未渲染文本保持完整；生成的显示标签不进入原始字段。 |
 
 已记录文件名优先于本地化的编号图片标签。元数据来自记录字段或文件扩展名，零字节大小仍然可见。视觉上截断的名称保留完整的无障碍文本和工具提示。无正文的消息仍在详情面板滚动区域内展示全部附件。

packages/client/ui-attachment/README.i18n.yaml

@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write packages/client/ui-attachment/README.md
-README.md: 8272703a56d05295e3cb14f3441bce1eeafe1629
-README.zh.md: ae8d687448f947306830982a770f7f54e019361f
+README.md: 0765068c73c8ca3cf79b8b23a54629669625ca2e
+README.zh.md: 5976acfda5b605dd85ba3d43e18a83af4d9d58e0

packages/client/ui-attachment/README.md

@@ -35,7 +35,7 @@ Images and generic files retain pick order in one non-wrapping horizontal rail.
 
 In Chat, one user message presents files and images in a right-aligned wrapping flow that preserves source order. A lone image without another attachment renders at 240px on its longer edge (aspect clamped to [0.25, 4], never upscaled); when the message has more than one attachment, each image is a fixed 64px square beside 240×64px file cards. A loaded image opens the document-level lightbox on click; a failed load shows a retry control instead. The lightbox closes on Escape, a mask press, or its close control, and restores focus to its opener.
 
-Trajectory attachment rows request 48px square thumbnails that contain the complete image without cropping. Loading and retry controls keep the same box, and the image opens the same lightbox. A slot owner may supply a presentation-only image label for the thumbnail and lightbox without changing the durable reference or the cache lookup.
+Trajectory attachment rows request 48px square thumbnails that contain the complete image without cropping. Loading and retry icons keep the same box, with localized tooltips and accessible names; the image opens the same lightbox. A slot owner may supply a presentation-only image label for the thumbnail and lightbox without changing the durable reference or the cache lookup.
 
 ### Drop overlay
 

packages/client/ui-attachment/README.zh.md

@@ -35,7 +35,7 @@ kind: "package-reference"
 
 Chat 中的一条用户消息把文件与图片放在同一个靠右、可换行的排列中，并保持来源顺序。消息仅有一张图片且没有其他附件时，图片按长边 240px 渲染（宽高比钳制在 [0.25, 4]，从不放大）；消息有多个附件时，每张图片显示为固定 64px 方块，与 240×64px 文件卡同排。加载完成的图片单击打开文档级灯箱；加载失败则显示重试控件。灯箱按 Escape、按下遮罩或点关闭按钮关闭，并把焦点还给打开者。
 
-Trajectory 附件行使用 48px 方形缩略图，完整缩放图片而不裁剪。加载与重试控件保持相同尺寸，图片打开同一个灯箱。插槽持有方可以为缩略图与灯箱提供仅用于展示的图片名称，而不改变持久化引用或缓存查询。
+Trajectory 附件行使用 48px 方形缩略图，完整缩放图片而不裁剪。加载与重试图标保持相同尺寸，提供本地化的工具提示和可访问名称；图片打开同一个灯箱。插槽持有方可以为缩略图与灯箱提供仅用于展示的图片名称，而不改变持久化引用或缓存查询。
 
 ### 拖放遮罩