Renderable types (.html/.htm) now show RENDERED by default again — but in a
sandboxed iframe (no scripts, no same-origin) so arbitrary HTML is safe — and a
header toggle flips to the CodeMirror source view (and back). Non-renderable
text files open straight in CodeMirror as before; PDF stays an iframe; markdown
keeps its own rendered/source toggle.
- RENDERABLE map + per-node view mode (rendered default; remembers only the
last-toggled node, so switching files resets). Toggle button sits by Pop out.
- The same-node render guard now allows a deliberate toggle through (prompting
to discard if the source editor is dirty); clearPreview hides the toggle.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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