fix(chat2mix): unblock build

- rename ExtendedKademliaDiscoveryParams -> ExtendedServiceDiscoveryParams
- switch sink from textlines[file] to textlines to work around a chronicles
  compile-time macro-eval bug under Nim 2.2.4

apps/chat2mix/chat2mix.nim

@@ -576,7 +576,7 @@ proc processInput(rfd: AsyncFD, rng: ref HmacDrbgContext) {.async.} =
     if kadBootstrapPeers.len > 0:
       node.wakuKademlia = WakuKademlia.new(
         node.switch,
-        ExtendedKademliaDiscoveryParams(
+        ExtendedServiceDiscoveryParams(
           bootstrapNodes: kadBootstrapPeers,
           mixPubKey: some(mixPubKey),
           advertiseMix: false,

waku.nimble

@@ -159,9 +159,13 @@ task chat2mix, "Build example Waku chat mix usage":
   #buildBinary name, "examples/", "-d:chronicles_log_level=WARN"
 
   let name = "chat2mix"
+  # Sink uses textlines (stdout) instead of textlines[file]: the latter
+  # currently triggers a chronicles compile-time macro-eval bug with Nim 2.2.4.
+  # Callers can redirect stdout to a file (the existing run_chat_mix*.sh
+  # scripts already do this).
   buildBinary name,
     "apps/chat2mix/",
-    "-d:chronicles_sinks=textlines[file] -d:chronicles_log_level='TRACE' "
+    "-d:chronicles_sinks=textlines -d:chronicles_log_level='TRACE' "
   #  -d:ssl - cause unlisted exception error in libp2p/utility...
 
 task chat2bridge, "Build chat2bridge":