Academic Notes 2.9.0

• Add experimental PDF figure priorities: shrink visuals to 80%, safely advance ordinary paragraphs, or keep page gaps. Bound attempts and restore normal layout on exhausted attempts or failed final verification.
• Keep mathematical environments and nested figures in place; preserve source notes, numbering and complete captions.
• Align diagram math labels and arrows in pure SVG coordinates for mobile views. Add touch-sized preview arrow selection and direct rendered diagram deletion without source mode.
• Share Figure numbering and cross-file/book references between standalone diagrams and pictures. Add optional captions and unique IDs for newly inserted diagrams; avoid counting enclosing figures twice.
• Update English and Chinese documentation, examples and the diagram illustration.

Validation: 18 Node tests, mobile bundle loading, real MathJax/CodeMirror browser interactions, 39 palette cases, and actual PDF float priorities, boundary checks and rollback under default, Phycat and Minimal styles. Internal links and isolated printing remain covered. Physical iPad verification remains separate.

The three installation assets are built by GitHub Actions and include artifact attestations.