5.7.0

Release notes for 5.7.0.

Released: 2026-08-20

Features

• NAV_OVERFLOW_SCRIPT is now shipped as a committed, drift-gated literal generated at package build time — its bytes no longer depend on the consumer's bundler, so one published CSP inline-script hash covers every rendering. The frozen output is byte-identical to the previous render-time assembly, so no hash changes with this release (93865aac)

• A check:nav-overflow-drift guard now runs in b4push (step 14 of the 29-step suite), CI, the b4push/CI parity manifest, and prepack, so any future change to the script's sources fails loudly instead of silently shifting consumer CSP hashes (a9440c2e)

Bug Fixes

• The mobile drawer no longer keeps a stale section tree and active marker after a same-locale cross-section soft navigation: nested-island data-props inside persisted elements are refreshed at the zfb:before-swap seam, generalizing zfb's top-level persisted-island refresh. Locale-toggle behavior and header persistence are unchanged (9dd1b77c)

• Islands whose dynamic import is still in flight across a swap now remount from the refreshed props (data-zfb-island-remount is set on change), closing a race where the drawer could mount from the pre-navigation snapshot (797e9a8c)

• prepack now also gates on check:search-widget-drift, so packing from a drifted tree can no longer publish CSP-breaking SEARCH_WIDGET_SCRIPT bytes (5103feb3)

Other Changes

• New mobile cross-section soft-navigation e2e regression spec for the drawer (smoke fixture), with shared drawer helpers (5ac8f536)

• Route-injection parity snapshots re-baselined with full attribution; the file now documents that a further unexplained hash move must be treated as live non-determinism and diagnosed rather than re-pinned (7a607cd5)

• Testing docs aligned with the test-hardening retiering: fast/slow lanes clarified and post-retiering counts corrected (07fff398)