Refactor: reduce nesting depth in 2 functions

Extract nested logic into helper functions to improve readability:
- broadcast_task_supervisor.ex: extract broadcast_to_topics/3 helper
- log_sanitizer.ex: extract redact_match/1 helper

Progress: 2/42 refactoring opportunities fixed

lib/aprsme/broadcast_task_supervisor.ex

@@ -51,9 +51,7 @@ defmodule Aprsme.BroadcastTaskSupervisor do
         # Process in chunks to balance load
         |> Stream.chunk_every(10)
         |> Enum.each(fn topic_chunk ->
-          Enum.each(topic_chunk, fn topic ->
-            Phoenix.PubSub.broadcast(pubsub, topic, message)
-          end)
+          broadcast_to_topics(topic_chunk, message, pubsub)
         end)
       end)
 
@@ -102,4 +100,11 @@ defmodule Aprsme.BroadcastTaskSupervisor do
   rescue
     _ -> 0.0
   end
+
+  # Private helper to broadcast to multiple topics
+  defp broadcast_to_topics(topics, message, pubsub) do
+    Enum.each(topics, fn topic ->
+      Phoenix.PubSub.broadcast(pubsub, topic, message)
+    end)
+  end
 end

lib/aprsme/log_sanitizer.ex

@@ -43,17 +43,20 @@ defmodule Aprsme.LogSanitizer do
 
   def sanitize_map(data), do: data
 
+  # Helper to redact a matched sensitive pattern
+  defp redact_match(match) do
+    case String.split(match, ["=", ":"]) do
+      [key, _value] -> "#{key}=[REDACTED]"
+      _ -> "[REDACTED]"
+    end
+  end
+
   @doc """
   Sanitize a string by replacing sensitive patterns
   """
   def sanitize_string(data) when is_binary(data) do
     Enum.reduce(@sensitive_patterns, data, fn pattern, acc ->
-      Regex.replace(pattern, acc, fn match ->
-        case String.split(match, ["=", ":"]) do
-          [key, _value] -> "#{key}=[REDACTED]"
-          _ -> "[REDACTED]"
-        end
-      end)
+      Regex.replace(pattern, acc, &redact_match/1)
     end)
   end