fix: sniff chat attachment mime (#670) (thanks @cristip73)

src/gateway/server-methods/chat.ts

@@ -200,15 +200,15 @@ export const chatHandlers: GatewayRequestHandlers = {
                   ).toString("base64")
                 : undefined,
         }))
-        .filter((a) => a.content && a.mimeType) ?? [];
+        .filter((a) => a.content) ?? [];
     let parsedMessage = p.message;
     let parsedImages: ChatImageContent[] = [];
     if (normalizedAttachments.length > 0) {
       try {
-        const parsed = parseMessageWithAttachments(
+        const parsed = await parseMessageWithAttachments(
           p.message,
           normalizedAttachments,
-          { maxBytes: 5_000_000 },
+          { maxBytes: 5_000_000, log: context.logGateway },
         );
         parsedMessage = parsed.message;
         parsedImages = parsed.images;

src/gateway/server-methods/types.ts

@@ -32,6 +32,7 @@ export type GatewayRequestContext = {
   getHealthCache: () => HealthSummary | null;
   refreshHealthSnapshot: (opts?: { probe?: boolean }) => Promise<HealthSummary>;
   logHealth: { error: (message: string) => void };
+  logGateway: { warn: (message: string) => void };
   incrementPresenceVersion: () => number;
   getHealthVersion: () => number;
   broadcast: (