feat(wxread): align pagination, rendering, and docs

.planning/phases/08-pagination-quality-cache-performance/08-UAT.md

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+---
+status: testing
+phase: 08-pagination-quality-cache-performance
+source:
+  - 08-01-SUMMARY.md
+  - 08-02-SUMMARY.md
+  - 08-03-SUMMARY.md
+started: 2026-05-23T23:20:00+08:00
+updated: 2026-05-24T00:12:00+08:00
+---
+
+## Current Test
+
+number: 4
+name: avoidPageBreakInside enforcement
+expected: |
+  Navigate to a chapter with block-level elements (images, code blocks, tables, blockquotes).
+  Page breaks should NOT split a block — if a block doesn't fit on the current page, the entire block moves to the next page.
+  The block should appear complete on a single page, not cut in half across two pages.
+awaiting: user response
+
+## Tests
+
+### 1. Cache hit/miss logging
+result: pass
+
+### 2. Cache invalidation on parameter change
+result: pass
+
+### 3. Performance timing output
+result: pass
+
+### 4. avoidPageBreakInside enforcement
+expected: Block-level elements not split across page boundaries
+result: [pending]
+
+### 5. Orphan/widow control
+expected: No 1-2 line paragraphs at page start or end
+result: [pending]
+
+### 6. General image fit-to-page
+expected: Large images scaled to fit within 85% page height
+result: [pending]
+
+### 7. Dark mode image preservation
+expected: Images keep original colors in dark mode
+result: [pending]
+
+### 8. Image vertical centering
+expected: Block-level images vertically centered on page
+result: [pending]
+
+## Summary
+
+total: 8
+passed: 3
+issues: 0
+pending: 5
+skipped: 0
+
+## Gaps
+
+[none yet]