Comments list pagination

[adedw]

What to build

ListCommentsQuery loads all of the user's comments without take/skip. Add pagination (offset or cursor — pick the simpler fit) through the full vertical path: query projection → page model → Index page UI with a pager.

Acceptance criteria

• Index page shows a bounded page of the user's comments with working pager navigation.
• Query stays a no-tracking DTO projection and never loads the unbounded set.
• Demoable: enough comments to exceed one page shows navigation working end-to-end.

Blocked by

None (can start immediately).