fix(kinds): use semantic icons for blocked and search relay lists

- Kind 10006 (Blocked Relays): Radio → ShieldBan
- Kind 10007 (Search Relays): Radio → Search

These icons propagate to KindBadge, settings accordions, and event
renderers via getKindInfo(). Generic relay kinds (10002, 30002, etc.)
keep the Radio icon.

https://claude.ai/code/session_01JHirYU56sKDKYhRx6aCQ54

src/constants/kinds.ts

@@ -48,8 +48,10 @@ import {
   Presentation,
   Radio,
   Repeat,
+  Search,
   Settings,
   Shield,
+  ShieldBan,
   ShoppingBag,
   Smile,
   Star,
@@ -757,14 +759,14 @@ export const EVENT_KINDS: Record<number | string, EventKind> = {
     name: "Blocked Relay List",
     description: "Blocked relays list",
     nip: "51",
-    icon: Radio,
+    icon: ShieldBan,
   },
   10007: {
     kind: 10007,
     name: "Search Relay List",
     description: "Search relays list",
     nip: "51",
-    icon: Radio,
+    icon: Search,
   },
   10009: {
     kind: 10009,