feat(manage-files): add OG screenshots tab

[Innei]

Summary

• Surface enrichment-captured page screenshots inside the file management page so admins can review what the headless browser pulled for each link card, without leaving the file workflow.
• Grid view with thumbnail, title/URL, dimensions, bytes; hover actions: copy screenshot URL, open source page, recapture (popconfirm), delete (popconfirm).
• 24 / page, sorted by `last_accessed desc`; reuses `enrichmentApi.screenshots` and `queryKeys.enrichment.screenshots` so cache invalidates consistently with the existing master-detail screenshots view at `/enrichment?source=screenshots`.
• Upload header button is suppressed on this tab — screenshots are pipeline-produced, not user-uploaded.

Pairs with mx-space/core#2724 (Open Graph browser-mode hardening).

Test plan

• `npx tsc --noEmit` — clean
• `npx biome check` on changed files — clean
• Visual smoke: open Files page → switch to "OG 截图" tab → grid renders, pagination works, recapture / delete fire correctly

[safedep]

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