Two fixes:
1. cookie-import relative path bypass (#707): path.isAbsolute() gated the
entire validation, so relative paths like "sensitive-file.json" bypassed
the safe-directory check entirely. Now always resolves to absolute path
with realpathSync for symlink resolution, matching validateOutputPath().
2. Hardcoded /tmp in cookie-import-browser (#708): openDbFromCopy used
/tmp directly instead of os.tmpdir(), breaking Windows support.
Also adds explicit imports for SAFE_DIRECTORIES and isPathWithin in
write-commands.ts (previously resolved implicitly through bundler).
Closes#852
Co-Authored-By: Toby Morning <urbantech@users.noreply.github.com>
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