fix: code-in-table CSS sizing + markdown image rendering (#486, #487)
- static/style.css: add td code / th code rules (font-size 0.85em,
padding 1px 4px, vertical-align baseline) for both .msg-body and
.preview-md to fix cramped inline code in table cells (#486)
- static/ui.js inlineMd(): add image pass ( → <img
class=msg-media-img>) running while _code_stash is active (protects
image syntax inside backticks), add _img_stash (\x00G) to shield
rendered <img> src= from autolink, add img to SAFE_INLINE (#487)
- static/ui.js renderMd() outer: add image pass before outer link pass
for images in plain paragraphs, add img to SAFE_TAGS allowlist (#487)
- tests/test_issue486_487.py: 45 new tests covering CSS source checks,
JS source structure, rendering behaviour, and combination edge cases
(code + image + link in same table cell, image inside code span, etc.)
Closes #486, closes #487
887893ecd1