Cross-platform: hardcoded /tmp in cookie-import-browser.ts

[robertoecf]

Spotted this while reviewing our vendored gstack install.

File: browse/src/cookie-import-browser.ts:390

The path /tmp is hardcoded here. Breaks on Windows. You already have TEMP_DIR in platform.ts for exactly this — just needs to be used here too:

const tmpPath = path.join(TEMP_DIR, "browse-cookies-" + browserName.toLowerCase() + "-" + crypto.randomUUID() + ".db");

Small fix, happy to send a PR.