feat(whatsapp): add sendReadReceipts config option

Add option to disable automatic read receipts for WhatsApp messages.
When set to false, Clawdbot will not mark messages as read (blue ticks).

Closes #344

Changes:
- Add sendReadReceipts to WhatsAppConfig and WhatsAppAccountConfig types
- Add sendReadReceipts to zod schemas for validation
- Add sendReadReceipts to ResolvedWhatsAppAccount with fallback chain
- Pass sendReadReceipts through to monitorWebInbox
- Gate sock.readMessages() call based on config option

Default behavior (true) is preserved - only explicitly setting false
will disable read receipts.

src/web/accounts.ts

@@ -12,6 +12,7 @@ export type ResolvedWhatsAppAccount = {
   accountId: string;
   name?: string;
   enabled: boolean;
+  sendReadReceipts: boolean;
   messagePrefix?: string;
   authDir: string;
   isLegacyAuthDir: boolean;
@@ -125,6 +126,7 @@ export function resolveWhatsAppAccount(params: {
   cfg: ClawdbotConfig;
   accountId?: string | null;
 }): ResolvedWhatsAppAccount {
+  const rootCfg = params.cfg.channels?.whatsapp;
   const accountId = params.accountId?.trim() || resolveDefaultWhatsAppAccountId(params.cfg);
   const accountCfg = resolveAccountConfig(params.cfg, accountId);
   const enabled = accountCfg?.enabled !== false;
@@ -136,22 +138,21 @@ export function resolveWhatsAppAccount(params: {
     accountId,
     name: accountCfg?.name?.trim() || undefined,
     enabled,
+    sendReadReceipts: accountCfg?.sendReadReceipts ?? rootCfg?.sendReadReceipts ?? true,
     messagePrefix:
-      accountCfg?.messagePrefix ??
-      params.cfg.channels?.whatsapp?.messagePrefix ??
-      params.cfg.messages?.messagePrefix,
+      accountCfg?.messagePrefix ?? rootCfg?.messagePrefix ?? params.cfg.messages?.messagePrefix,
     authDir,
     isLegacyAuthDir: isLegacy,
-    selfChatMode: accountCfg?.selfChatMode ?? params.cfg.channels?.whatsapp?.selfChatMode,
-    dmPolicy: accountCfg?.dmPolicy ?? params.cfg.channels?.whatsapp?.dmPolicy,
-    allowFrom: accountCfg?.allowFrom ?? params.cfg.channels?.whatsapp?.allowFrom,
-    groupAllowFrom: accountCfg?.groupAllowFrom ?? params.cfg.channels?.whatsapp?.groupAllowFrom,
-    groupPolicy: accountCfg?.groupPolicy ?? params.cfg.channels?.whatsapp?.groupPolicy,
-    textChunkLimit: accountCfg?.textChunkLimit ?? params.cfg.channels?.whatsapp?.textChunkLimit,
-    mediaMaxMb: accountCfg?.mediaMaxMb ?? params.cfg.channels?.whatsapp?.mediaMaxMb,
-    blockStreaming: accountCfg?.blockStreaming ?? params.cfg.channels?.whatsapp?.blockStreaming,
-    ackReaction: accountCfg?.ackReaction ?? params.cfg.channels?.whatsapp?.ackReaction,
-    groups: accountCfg?.groups ?? params.cfg.channels?.whatsapp?.groups,
+    selfChatMode: accountCfg?.selfChatMode ?? rootCfg?.selfChatMode,
+    dmPolicy: accountCfg?.dmPolicy ?? rootCfg?.dmPolicy,
+    allowFrom: accountCfg?.allowFrom ?? rootCfg?.allowFrom,
+    groupAllowFrom: accountCfg?.groupAllowFrom ?? rootCfg?.groupAllowFrom,
+    groupPolicy: accountCfg?.groupPolicy ?? rootCfg?.groupPolicy,
+    textChunkLimit: accountCfg?.textChunkLimit ?? rootCfg?.textChunkLimit,
+    mediaMaxMb: accountCfg?.mediaMaxMb ?? rootCfg?.mediaMaxMb,
+    blockStreaming: accountCfg?.blockStreaming ?? rootCfg?.blockStreaming,
+    ackReaction: accountCfg?.ackReaction ?? rootCfg?.ackReaction,
+    groups: accountCfg?.groups ?? rootCfg?.groups,
   };
 }