Release 2026.9.28.4

The personal-data catalog and what it feeds: the data inventory and its
snapshots (#83, #89), the Compliance Officer roles (#88), the Compliance
Overview and Data Inventory menu entries (#92). Log file retention
(#87), privacy defaults for new installs (#85, #90), webhooks that send
only the events they name (#82), and upstream v0.16.24 (#84), whose
spam rules updates keep what an admin edited.

Explain: 12 settings asked about (upstream's new createdAt fields, the
certificate dates and the webhook events policy), with the release's
recommended model built locally; 705 answers carry over.

crates/types/src/branding.rs

@@ -81,7 +81,7 @@ fn legacy_setting(name: &str, is_set: impl Fn(&str) -> bool) -> Option<String> {
 #[macro_export]
 macro_rules! brand_version {
     () => {
-        "2026.9.28.3"
+        "2026.9.28.4"
     };
 }