[D-3] Mock the History screen

[liangricky7]

Blocked by: D-1 (#30), only if the mock shows a comparison · Blocks: —

(Was sprint 1 ticket 12.) History, tag browsing, notifications and the review screens have no mockups yet. They can be built from the component rules, but with less guidance than the four screens that have one.

History first. It has the one genuinely unusual rule in the product: the list of revisions is visible to readers, but comparing them requires edit rights. That split protects hidden sections in v2, and it's the kind of rule that gets built wrong from prose alone.

• A self-contained HTML mockup in docs/mockups/, like the existing four, built from the DESIGN.md tokens
• Shows the revision list: author, absolute timestamp, and number of revisions (the data T2-3 ([T2-3] Revision list #12) returns)
• Shows the v1 state (no role split, so the list and comparisons are both open) and notes where the v2 restriction applies

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Source: docs/frontend-tickets.md