fix(carousel): remove hasSubtitle proto field + add debug logging

- Remove hasSubtitle (field 10) from Header proto definition, index.js
  and index.d.ts - this field was adding extra bytes to encoded protobuf
  that working implementations don't send, potentially causing rejection
- Remove hasSubtitle from carousel card headers and root header
- Add [CAROUSEL DEBUG] logging in relayMessage to dump:
  - Encoded message bytes as base64 (for binary comparison)
  - Message structure as JSON
  - Per-device encoded bytes with DSM flag
- This enables byte-level comparison with working implementations

https://claude.ai/code/session_01EK9NpViRCtda1WAvFd8ptR

WAProto/WAProto.proto

@@ -2717,7 +2717,6 @@ message Message {
             optional string title = 1;
             optional string subtitle = 2;
             optional bool hasMediaAttachment = 5;
-            optional bool hasSubtitle = 10;
             oneof media {
                 Message.DocumentMessage documentMessage = 3;
                 Message.ImageMessage imageMessage = 4;

WAProto/index.d.ts

@@ -6854,7 +6854,6 @@ export namespace proto {
                 title?: (string|null);
                 subtitle?: (string|null);
                 hasMediaAttachment?: (boolean|null);
-                hasSubtitle?: (boolean|null);
                 documentMessage?: (proto.Message.IDocumentMessage|null);
                 imageMessage?: (proto.Message.IImageMessage|null);
                 jpegThumbnail?: (Uint8Array|null);
@@ -6868,7 +6867,6 @@ export namespace proto {
                 public title?: (string|null);
                 public subtitle?: (string|null);
                 public hasMediaAttachment?: (boolean|null);
-                public hasSubtitle?: (boolean|null);
                 public documentMessage?: (proto.Message.IDocumentMessage|null);
                 public imageMessage?: (proto.Message.IImageMessage|null);
                 public jpegThumbnail?: (Uint8Array|null);

WAProto/index.js

@@ -48195,7 +48195,6 @@ export const proto = $root.proto = (() => {
                 Header.prototype.title = null;
                 Header.prototype.subtitle = null;
                 Header.prototype.hasMediaAttachment = null;
-                Header.prototype.hasSubtitle = null;
                 Header.prototype.documentMessage = null;
                 Header.prototype.imageMessage = null;
                 Header.prototype.jpegThumbnail = null;
@@ -48223,12 +48222,6 @@ export const proto = $root.proto = (() => {
                     set: $util.oneOfSetter($oneOfFields)
                 });
 
-                // Virtual OneOf for proto3 optional field
-                Object.defineProperty(Header.prototype, "_hasSubtitle", {
-                    get: $util.oneOfGetter($oneOfFields = ["hasSubtitle"]),
-                    set: $util.oneOfSetter($oneOfFields)
-                });
-
                 Object.defineProperty(Header.prototype, "media", {
                     get: $util.oneOfGetter($oneOfFields = ["documentMessage", "imageMessage", "jpegThumbnail", "videoMessage", "locationMessage", "productMessage"]),
                     set: $util.oneOfSetter($oneOfFields)
@@ -48251,8 +48244,6 @@ export const proto = $root.proto = (() => {
                         $root.proto.Message.ImageMessage.encode(m.imageMessage, w.uint32(34).fork()).ldelim();
                     if (m.hasMediaAttachment != null && Object.hasOwnProperty.call(m, "hasMediaAttachment"))
                         w.uint32(40).bool(m.hasMediaAttachment);
-                    if (m.hasSubtitle != null && Object.hasOwnProperty.call(m, "hasSubtitle"))
-                        w.uint32(80).bool(m.hasSubtitle);
                     if (m.jpegThumbnail != null && Object.hasOwnProperty.call(m, "jpegThumbnail"))
                         w.uint32(50).bytes(m.jpegThumbnail);
                     if (m.videoMessage != null && Object.hasOwnProperty.call(m, "videoMessage"))
@@ -48309,10 +48300,6 @@ export const proto = $root.proto = (() => {
                                 m.productMessage = $root.proto.Message.ProductMessage.decode(r, r.uint32());
                                 break;
                             }
-                        case 10: {
-                                m.hasSubtitle = r.bool();
-                                break;
-                            }
                         default:
                             r.skipType(t & 7);
                             break;
@@ -48334,9 +48321,6 @@ export const proto = $root.proto = (() => {
                     if (d.hasMediaAttachment != null) {
                         m.hasMediaAttachment = Boolean(d.hasMediaAttachment);
                     }
-                    if (d.hasSubtitle != null) {
-                        m.hasSubtitle = Boolean(d.hasSubtitle);
-                    }
                     if (d.documentMessage != null) {
                         if (typeof d.documentMessage !== "object")
                             throw TypeError(".proto.Message.InteractiveMessage.Header.documentMessage: object expected");
@@ -48400,11 +48384,6 @@ export const proto = $root.proto = (() => {
                         if (o.oneofs)
                             d._hasMediaAttachment = "hasMediaAttachment";
                     }
-                    if (m.hasSubtitle != null && m.hasOwnProperty("hasSubtitle")) {
-                        d.hasSubtitle = m.hasSubtitle;
-                        if (o.oneofs)
-                            d._hasSubtitle = "hasSubtitle";
-                    }
                     if (m.jpegThumbnail != null && m.hasOwnProperty("jpegThumbnail")) {
                         d.jpegThumbnail = o.bytes === String ? $util.base64.encode(m.jpegThumbnail, 0, m.jpegThumbnail.length) : o.bytes === Array ? Array.prototype.slice.call(m.jpegThumbnail) : m.jpegThumbnail;
                         if (o.oneofs)