fix(notices): hand the release notice only to a bundle built for the running version

After an update the service worker keeps serving the previous bundle until
the new one is installed. That shell announces the release layout too, so
the layout alone let it draw the notice with its own older texts and use it
up for the version now running with one click on X.

The bundle now sends the version it was built as (client/package.json, baked
in by define), and the server compares it with its own before it hands a
notice with a release block over. A shell of another version is told nothing
and gets the notice after the reload, from the bundle that can draw it. This
holds for every update, not only the one that introduced the parameter.

server/src/systemNotices/service.ts

@@ -5,7 +5,7 @@ import { SYSTEM_NOTICES } from './registry.js';
 import { evaluate } from './conditions.js';
 import type { SystemNotice, SystemNoticeDTO } from './types.js';
 
-function getCurrentAppVersion(): string {
+export function getCurrentAppVersion(): string {
   const fromEnv = semver.valid(readEnv().app.appVersion ?? '');
   if (fromEnv) return fromEnv;
   try {