Add "Viewed" tracking for individual diff sections (hunks) within a file

[sharon-fdm]

When reviewing a PR, GitHub lets me mark entire files as "Viewed" which is very helpful for tracking progress. However, large files with many changes are hard to review in one pass. I often review part of a file, context-switch, and come back later unable to remember which sections (hunks) within that file I already reviewed.

Proposal: Add a "Viewed" checkbox (or similar indicator) per diff hunk within a file, not just per file. This would let reviewers track their progress within large diffs the same way they already track it across files.

Use case: A file has +222 / -83 lines across 10+ diff hunks. I review the first 5 hunks, get pulled away, and return later. Currently I have to re-read everything to find where I left off. With per-hunk tracking, I would see exactly which sections I already covered.

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