feat(web): add group chat mention support

src/config/config.ts

@@ -43,6 +43,12 @@ export type WebConfig = {
   reconnect?: WebReconnectConfig;
 };
 
+export type GroupChatConfig = {
+  requireMention?: boolean;
+  mentionPatterns?: string[];
+  historyLimit?: number;
+};
+
 export type WarelayConfig = {
   logging?: LoggingConfig;
   inbound?: {
@@ -55,6 +61,7 @@ export type WarelayConfig = {
       command: string[];
       timeoutSeconds?: number;
     };
+    groupChat?: GroupChatConfig;
     reply?: {
       mode: ReplyMode;
       text?: string;
@@ -172,6 +179,13 @@ const WarelaySchema = z.object({
       messagePrefix: z.string().optional(),
       responsePrefix: z.string().optional(),
       timestampPrefix: z.union([z.boolean(), z.string()]).optional(),
+      groupChat: z
+        .object({
+          requireMention: z.boolean().optional(),
+          mentionPatterns: z.array(z.string()).optional(),
+          historyLimit: z.number().int().positive().optional(),
+        })
+        .optional(),
       transcribeAudio: z
         .object({
           command: z.array(z.string()),

src/config/sessions.test.ts

@@ -16,4 +16,10 @@ describe("sessions", () => {
   it("global scope returns global", () => {
     expect(deriveSessionKey("global", { From: "+1" })).toBe("global");
   });
+
+  it("keeps group chats distinct", () => {
+    expect(
+      deriveSessionKey("per-sender", { From: "12345-678@g.us" }),
+    ).toBe("group:12345-678@g.us");
+  });
 });

src/config/sessions.ts

@@ -59,5 +59,12 @@ export async function saveSessionStore(
 export function deriveSessionKey(scope: SessionScope, ctx: MsgContext) {
   if (scope === "global") return "global";
   const from = ctx.From ? normalizeE164(ctx.From) : "";
+  // Preserve group conversations as distinct buckets
+  if (typeof ctx.From === "string" && ctx.From.includes("@g.us")) {
+    return `group:${ctx.From}`;
+  }
+  if (typeof ctx.From === "string" && ctx.From.startsWith("group:")) {
+    return ctx.From;
+  }
   return from || "unknown";
 }