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- 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>