refactor(signal): dedupe outbound media limit resolve

src/channels/plugins/outbound/signal.ts

@@ -3,6 +3,18 @@ import { chunkText } from "../../../auto-reply/chunk.js";
 import { sendMessageSignal } from "../../../signal/send.js";
 import { resolveChannelMediaMaxBytes } from "../media-limits.js";
 
+function resolveSignalMaxBytes(params: {
+  cfg: Parameters<typeof resolveChannelMediaMaxBytes>[0]["cfg"];
+  accountId?: string | null;
+}) {
+  return resolveChannelMediaMaxBytes({
+    cfg: params.cfg,
+    resolveChannelLimitMb: ({ cfg, accountId }) =>
+      cfg.channels?.signal?.accounts?.[accountId]?.mediaMaxMb ?? cfg.channels?.signal?.mediaMaxMb,
+    accountId: params.accountId,
+  });
+}
+
 export const signalOutbound: ChannelOutboundAdapter = {
   deliveryMode: "direct",
   chunker: chunkText,
@@ -10,12 +22,7 @@ export const signalOutbound: ChannelOutboundAdapter = {
   textChunkLimit: 4000,
   sendText: async ({ cfg, to, text, accountId, deps }) => {
     const send = deps?.sendSignal ?? sendMessageSignal;
-    const maxBytes = resolveChannelMediaMaxBytes({
+    const maxBytes = resolveSignalMaxBytes({ cfg, accountId });
-      cfg,
-      resolveChannelLimitMb: ({ cfg, accountId }) =>
-        cfg.channels?.signal?.accounts?.[accountId]?.mediaMaxMb ?? cfg.channels?.signal?.mediaMaxMb,
-      accountId,
-    });
     const result = await send(to, text, {
       maxBytes,
       accountId: accountId ?? undefined,
@@ -24,12 +31,7 @@ export const signalOutbound: ChannelOutboundAdapter = {
   },
   sendMedia: async ({ cfg, to, text, mediaUrl, mediaLocalRoots, accountId, deps }) => {
     const send = deps?.sendSignal ?? sendMessageSignal;
-    const maxBytes = resolveChannelMediaMaxBytes({
+    const maxBytes = resolveSignalMaxBytes({ cfg, accountId });
-      cfg,
-      resolveChannelLimitMb: ({ cfg, accountId }) =>
-        cfg.channels?.signal?.accounts?.[accountId]?.mediaMaxMb ?? cfg.channels?.signal?.mediaMaxMb,
-      accountId,
-    });
     const result = await send(to, text, {
       mediaUrl,
       maxBytes,