Add 1.4.5 release notes (#838)

Author: mike-thompson-day8

docs/releases/2026.md

@@ -6,6 +6,20 @@
 
 > The re-frame [Clojars page](https://clojars.org/re-frame/) contains dependency coordinates for Maven/deps/Lein.
 
+## 1.4.5 (2026-04-12)
+
+#### Fixed
+
+- Unreachable code warning during advanced compilation in `validate-inputs` ([#827](https://github.com/day8/re-frame/issues/827))
+- Broken documentation link in cofx-as-fx warning message ([#834](https://github.com/day8/re-frame/issues/834))
+
+#### Changed
+
+- Upgraded shadow-cljs in examples to 3.2.0 for ClojureScript 1.12.42 compatibility ([#833](https://github.com/day8/re-frame/issues/833))
+- Removed alpha toggle demo from todomvc example
+- Pinned GitHub Actions to commit SHAs for supply chain security
+- Migrated docs deployment to Pages artifact
+
 ## 1.4.4 (2026-01-03)
 
 #### Added