- N100: restrict <pre> classes to language-* in sanitize-html allowedClasses;
previously `class` was allowed on <pre> with no allowedClasses entry, so a
remote sender could inject arbitrary class names that activate site CSS.
- N106: OS notifications for E2EE rooms no longer carry decrypted plaintext
(which persists in the OS notification center / lock screen). Encrypted rooms
show only the sender; the in-page toast still previews while focused.
- N109: OS notification icon/badge use the static app logo instead of an
authenticated-media avatar URL the OS can't fetch (was 401 / no icon). The
in-app toast keeps the real room avatar (it can fetch via the SW).
- N119: syncDecorations.mjs distinguishes a confirmed 404 (remove) from a
network/5xx failure (abort) so a transient CDN outage can't silently wipe the
whole decoration catalog from source control.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>