Fix comment analytics overview review issues

[jonatansberg]

Summary

Draft PR stacked on top of comment-analytics-overview.

This addresses review follow-ups for the comment analytics overview:

• refactors the comments page composition so CommentsLayout, CommentsMain, CommentsSidebar, and CommentsAnalytics have clearer layout/content boundaries
• fixes reported-bar filter updates so date and reported filters are applied atomically
• fixes year-to-date range handling and hides comparison deltas where the copy would be misleading
• adds a compact analytics error state with retry
• buckets comment analytics series by the requested timezone instead of raw SQL DATE(created_at)
• adds real DB integration coverage and stronger Admin API e2e assertions for analytics totals, previous totals, top posts, top commenters, reports, hidden filtering, and timezone-local buckets

Validation

• pnpm --filter @tryghost/posts test:unit
• pnpm --filter @tryghost/posts lint:code (passes with existing unrelated use-post-success-modal.ts warning)
• pnpm --dir ghost/core test:single test/integration/services/comments-stats-service.test.js
• pnpm --dir ghost/core test:single test/e2e-api/admin/stats.test.js
• git diff --check origin/main...HEAD

Notes

gh auth status reports an invalid local token, so this PR was created via the GitHub connector after pushing the branch over SSH.

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