Replaced string literals for thumbnail sizes with GetThumbnailByUriSizeEnum throughout the codebase for improved type safety and consistency. Updated generateThumbnailUrl to accept the enum and added a width map for local URLs. Improved attachment thumbnail display and link formatting.
#### What type of PR is this?
/area ui
/kind feature
/milestone 2.21.x
#### What this PR does / why we need it:
Add thumbnail records viewing feature. The main goal is to keep track of failed thumbnail generations, making it easier to check if thumbnails were generated correctly and retry if needed.
<img width="1009" height="859" alt="image" src="https://github.com/user-attachments/assets/d968e416-0b88-45bf-a554-a0c1abcf97a0" />
<img width="1014" height="952" alt="image" src="https://github.com/user-attachments/assets/c5d1a11b-7acc-4ab5-a2da-cf9467cb6b70" />
#### Which issue(s) this PR fixes:
Fixes #
#### Special notes for your reviewer:
#### Does this PR introduce a user-facing change?
```release-note
支持查看附件缩略图记录
```
Ryan Wang