docs: changelog — unknown-store hardening under 0.25.0

Signed-off-by: flemming-it <sf@flemming.it>

CHANGELOG.md

@@ -38,6 +38,16 @@ Project separation in the flow list:
   hard-wired `~/.chain/data/flows` — the new widget tests run
   against a temp dir, never the operator's flows.
 
+Disturbance hardening:
+
+- **Unknown ≠ absent.** `storeCapabilities` is nullable now
+  (null = store state unknown): missing capabilities then render
+  the plain missing chip with an honest tooltip — no install
+  offer, no "not in store" claim — and the analyzer message says
+  the store cannot be checked right now (EN + DE). Previously an
+  unreachable store made every missing capability claim
+  "not in store".
+
 ## 0.24.1
 
 - No ALL-CAPS "FLOWS" panel header: the page toolbar already names