Bump app version to V0.1.4

Update APP_VERSION in frontend/src/lib/version.ts from V0.1.3 to V0.1.4 to reflect the new patch release.

frontend/src/lib/version.ts

@@ -1 +1 @@
-export const APP_VERSION = "V0.1.3";
+export const APP_VERSION = "V0.1.4";