fix: resolve all dialyzer type warnings across codebase

- Narrow @spec for NetworkInsightPrompt.build/1 and NetworkSnapshot.build/1
- Match/discard unmatched returns in monitoring.ex, alerts.ex, and
  cloud_latency_probe_worker.ex
- Remove unreachable :rate_limited pattern in mikrotik_webhook_worker.ex
  (resolve_error returns {:rate_limited, pos_integer()}, never bare atom)
- Fix gettext pluralisation in insights_live/index.ex: dngettext was
  receiving a string where it expected a non_neg_integer count

lib/towerops/alerts.ex

@@ -397,7 +397,7 @@ defmodule Towerops.Alerts do
         )
 
       Enum.each(alerts, fn alert ->
-        AlertNotificationWorker.enqueue_acknowledge(alert.id)
+        _ = AlertNotificationWorker.enqueue_acknowledge(alert.id)
         Subscriptions.publish_alert_event(alert, "acknowledged")
       end)
 

lib/towerops/llm/network_insight_prompt.ex

@@ -62,7 +62,7 @@ defmodule Towerops.LLM.NetworkInsightPrompt do
 
   @max_observations 5
 
-  @spec build(map()) :: [map()]
+  @spec build(map()) :: [%{role: String.t(), content: String.t()}]
   def build(snapshot) when is_map(snapshot) do
     payload = Jason.encode!(snapshot, pretty: true)
 

lib/towerops/llm/network_snapshot.ex

@@ -57,7 +57,18 @@ defmodule Towerops.LLM.NetworkSnapshot do
   @top_n 10
   @stale_poll_hours 24
 
-  @spec build(String.t()) :: map()
+  @spec build(String.t()) :: %{
+          :agents => map(),
+          :backhaul => map(),
+          :existing_insights => term(),
+          :gaiia => map(),
+          :organization_id => String.t(),
+          :organization_name => term(),
+          :preseem => map(),
+          :snmp => map(),
+          :totals => map(),
+          :wireless => map()
+        }
   def build(organization_id) when is_binary(organization_id) do
     %{
       organization_id: organization_id,

lib/towerops/monitoring.ex

@@ -478,6 +478,7 @@ defmodule Towerops.Monitoring do
         :ok
 
       ids ->
+        _ =
           Oban.cancel_all_jobs(
             from(j in Oban.Job,
               where: j.queue == "check_executors",

lib/towerops/workers/cloud_latency_probe_worker.ex

@@ -38,7 +38,9 @@ defmodule Towerops.Workers.CloudLatencyProbeWorker do
 
     device_chunks = Enum.chunk_every(devices, @chunk_size)
 
+    _ =
       for poller <- cloud_pollers do
+        _ =
           for chunk <- device_chunks do
             Phoenix.PubSub.broadcast(
               Towerops.PubSub,

lib/towerops/workers/mikrotik_webhook_worker.ex

@@ -59,8 +59,7 @@ defmodule Towerops.Workers.MikrotikWebhookWorker do
         # Gaiia outages will resolve on retry and we'll re-record the
         # event (events table dedupes nothing today, that's intentional —
         # the audit log is allowed to have duplicates from retries).
-        :rate_limited -> {:error, :rate_limited}
-        {:rate_limited, _} -> {:error, :rate_limited}
+        {:rate_limited, _retry_after} -> {:error, :rate_limited}
         _ -> :ok
       end
     end

lib/towerops_web/live/insights_live/index.ex

@@ -114,12 +114,15 @@ defmodule ToweropsWeb.InsightsLive.Index do
           {:info, t("Insight regeneration queued. New insights will appear shortly.")}
         else
           {:error,
-           "%{ok} worker queued, %{fail} worker failed to queue. Check logs."
-           |> ngettext(
+           Gettext.dngettext(
+             ToweropsWeb.Gettext,
+             "default",
+             "%{ok} worker queued, %{fail} worker failed to queue. Check logs.",
              "%{ok} workers queued, %{fail} workers failed to queue. Check logs.",
-             ok_count
-           )
-           |> then(&Gettext.dngettext(ToweropsWeb.Gettext, "", &1, &1, ok_count: ok_count, fail: fail_count))}
+             max(ok_count, 0),
+             ok_count: ok_count,
+             fail: fail_count
+           )}
         end
 
       {:noreply, put_flash(socket, elem(flash, 0), elem(flash, 1))}