safeHref lets only http, https and mailto become links (Markdown viewer,
outliner, legal links); javascript: and friends show as text. A
middleware sets a Content-Security-Policy (scripts only from MindSift,
no framing, connections only to this server), X-Frame-Options,
nosniff, Referrer-Policy and a Permissions-Policy. The two inline
scripts of index.html moved to files so script-src stays 'self'.
The second inline script also deleted every cache on each page load,
which undermined the offline start; it is gone.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
