release: prepare a3s 0.10.14

[ZhiXiao-Lin]

Summary

• prepare CLI and release metadata for 0.10.14
• pin the immutable A3S Web source to 996c707e95ff87d9907c7d0901c7cf4714bd1e58
• include the PDF Live Preview full-height regression fix from fix(web): keep PDF live preview at panel height a3s#65

Validation

• release-state self-tests
• release consistency check for CLI 0.10.14 / Core 6.5.2 / TUI 0.1.14 / Search 2.1.0
• cargo fmt --all -- --check
• cargo metadata --format-version 1 --no-deps
• git diff --check
• pinned Web source inspected at the exact immutable commit
• Web source: format, lint, typecheck, production build, 205 test files / 1,230 tests
• real browser PDF renderer chain: stage, document, viewer, embed wrapper, native wrapper, and EmbedPDF host all measure 422px