feat(gateway): confirmEmailLink RPC + language on the email request + profile event

Add the confirm-link edge method (auth.email.confirm_link): a new
EmailConfirmLinkRequest/Result fbs table, the transcode const + handler + encoder,
and the backend-client call to the existing /sessions/email/confirm-link endpoint —
it rides Execute under the existing service prefix, so no proto/Caddy change. Add a
language field to EmailRequestRequest and forward it (the backend already seeds it).
Add the NotifyProfile sub-kind + notify.ProfileChanged, published by the confirm-link
handler on a successful link so an in-app session re-fetches its profile when the
email was confirmed in another browser. Regenerated fbs bindings (Go + TS).

ui/src/gen/fbs/scrabblefb.ts

@@ -17,6 +17,8 @@ export { ComplaintRequest } from './scrabblefb/complaint-request.js';
 export { CreateInvitationRequest } from './scrabblefb/create-invitation-request.js';
 export { DraftRequest } from './scrabblefb/draft-request.js';
 export { DraftView } from './scrabblefb/draft-view.js';
+export { EmailConfirmLinkRequest } from './scrabblefb/email-confirm-link-request.js';
+export { EmailConfirmLinkResult } from './scrabblefb/email-confirm-link-result.js';
 export { EmailLoginRequest } from './scrabblefb/email-login-request.js';
 export { EmailRequestRequest } from './scrabblefb/email-request-request.js';
 export { EnqueueRequest } from './scrabblefb/enqueue-request.js';

ui/src/gen/fbs/scrabblefb/email-confirm-link-request.ts

@@ -0,0 +1,48 @@
+// automatically generated by the FlatBuffers compiler, do not modify
+
+import * as flatbuffers from 'flatbuffers';
+
+export class EmailConfirmLinkRequest {
+  bb: flatbuffers.ByteBuffer|null = null;
+  bb_pos = 0;
+  __init(i:number, bb:flatbuffers.ByteBuffer):EmailConfirmLinkRequest {
+  this.bb_pos = i;
+  this.bb = bb;
+  return this;
+}
+
+static getRootAsEmailConfirmLinkRequest(bb:flatbuffers.ByteBuffer, obj?:EmailConfirmLinkRequest):EmailConfirmLinkRequest {
+  return (obj || new EmailConfirmLinkRequest()).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+}
+
+static getSizePrefixedRootAsEmailConfirmLinkRequest(bb:flatbuffers.ByteBuffer, obj?:EmailConfirmLinkRequest):EmailConfirmLinkRequest {
+  bb.setPosition(bb.position() + flatbuffers.SIZE_PREFIX_LENGTH);
+  return (obj || new EmailConfirmLinkRequest()).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+}
+
+token():string|null
+token(optionalEncoding:flatbuffers.Encoding):string|Uint8Array|null
+token(optionalEncoding?:any):string|Uint8Array|null {
+  const offset = this.bb!.__offset(this.bb_pos, 4);
+  return offset ? this.bb!.__string(this.bb_pos + offset, optionalEncoding) : null;
+}
+
+static startEmailConfirmLinkRequest(builder:flatbuffers.Builder) {
+  builder.startObject(1);
+}
+
+static addToken(builder:flatbuffers.Builder, tokenOffset:flatbuffers.Offset) {
+  builder.addFieldOffset(0, tokenOffset, 0);
+}
+
+static endEmailConfirmLinkRequest(builder:flatbuffers.Builder):flatbuffers.Offset {
+  const offset = builder.endObject();
+  return offset;
+}
+
+static createEmailConfirmLinkRequest(builder:flatbuffers.Builder, tokenOffset:flatbuffers.Offset):flatbuffers.Offset {
+  EmailConfirmLinkRequest.startEmailConfirmLinkRequest(builder);
+  EmailConfirmLinkRequest.addToken(builder, tokenOffset);
+  return EmailConfirmLinkRequest.endEmailConfirmLinkRequest(builder);
+}
+}

ui/src/gen/fbs/scrabblefb/email-confirm-link-result.ts

@@ -0,0 +1,66 @@
+// automatically generated by the FlatBuffers compiler, do not modify
+
+import * as flatbuffers from 'flatbuffers';
+
+import { Session } from '../scrabblefb/session.js';
+
+
+export class EmailConfirmLinkResult {
+  bb: flatbuffers.ByteBuffer|null = null;
+  bb_pos = 0;
+  __init(i:number, bb:flatbuffers.ByteBuffer):EmailConfirmLinkResult {
+  this.bb_pos = i;
+  this.bb = bb;
+  return this;
+}
+
+static getRootAsEmailConfirmLinkResult(bb:flatbuffers.ByteBuffer, obj?:EmailConfirmLinkResult):EmailConfirmLinkResult {
+  return (obj || new EmailConfirmLinkResult()).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+}
+
+static getSizePrefixedRootAsEmailConfirmLinkResult(bb:flatbuffers.ByteBuffer, obj?:EmailConfirmLinkResult):EmailConfirmLinkResult {
+  bb.setPosition(bb.position() + flatbuffers.SIZE_PREFIX_LENGTH);
+  return (obj || new EmailConfirmLinkResult()).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+}
+
+purpose():string|null
+purpose(optionalEncoding:flatbuffers.Encoding):string|Uint8Array|null
+purpose(optionalEncoding?:any):string|Uint8Array|null {
+  const offset = this.bb!.__offset(this.bb_pos, 4);
+  return offset ? this.bb!.__string(this.bb_pos + offset, optionalEncoding) : null;
+}
+
+status():string|null
+status(optionalEncoding:flatbuffers.Encoding):string|Uint8Array|null
+status(optionalEncoding?:any):string|Uint8Array|null {
+  const offset = this.bb!.__offset(this.bb_pos, 6);
+  return offset ? this.bb!.__string(this.bb_pos + offset, optionalEncoding) : null;
+}
+
+session(obj?:Session):Session|null {
+  const offset = this.bb!.__offset(this.bb_pos, 8);
+  return offset ? (obj || new Session()).__init(this.bb!.__indirect(this.bb_pos + offset), this.bb!) : null;
+}
+
+static startEmailConfirmLinkResult(builder:flatbuffers.Builder) {
+  builder.startObject(3);
+}
+
+static addPurpose(builder:flatbuffers.Builder, purposeOffset:flatbuffers.Offset) {
+  builder.addFieldOffset(0, purposeOffset, 0);
+}
+
+static addStatus(builder:flatbuffers.Builder, statusOffset:flatbuffers.Offset) {
+  builder.addFieldOffset(1, statusOffset, 0);
+}
+
+static addSession(builder:flatbuffers.Builder, sessionOffset:flatbuffers.Offset) {
+  builder.addFieldOffset(2, sessionOffset, 0);
+}
+
+static endEmailConfirmLinkResult(builder:flatbuffers.Builder):flatbuffers.Offset {
+  const offset = builder.endObject();
+  return offset;
+}
+
+}

ui/src/gen/fbs/scrabblefb/email-request-request.ts

@@ -34,8 +34,15 @@ browserTz(optionalEncoding?:any):string|Uint8Array|null {
   return offset ? this.bb!.__string(this.bb_pos + offset, optionalEncoding) : null;
 }
 
+language():string|null
+language(optionalEncoding:flatbuffers.Encoding):string|Uint8Array|null
+language(optionalEncoding?:any):string|Uint8Array|null {
+  const offset = this.bb!.__offset(this.bb_pos, 8);
+  return offset ? this.bb!.__string(this.bb_pos + offset, optionalEncoding) : null;
+}
+
 static startEmailRequestRequest(builder:flatbuffers.Builder) {
-  builder.startObject(2);
+  builder.startObject(3);
 }
 
 static addEmail(builder:flatbuffers.Builder, emailOffset:flatbuffers.Offset) {
@@ -46,15 +53,20 @@ static addBrowserTz(builder:flatbuffers.Builder, browserTzOffset:flatbuffers.Off
   builder.addFieldOffset(1, browserTzOffset, 0);
 }
 
+static addLanguage(builder:flatbuffers.Builder, languageOffset:flatbuffers.Offset) {
+  builder.addFieldOffset(2, languageOffset, 0);
+}
+
 static endEmailRequestRequest(builder:flatbuffers.Builder):flatbuffers.Offset {
   const offset = builder.endObject();
   return offset;
 }
 
-static createEmailRequestRequest(builder:flatbuffers.Builder, emailOffset:flatbuffers.Offset, browserTzOffset:flatbuffers.Offset):flatbuffers.Offset {
+static createEmailRequestRequest(builder:flatbuffers.Builder, emailOffset:flatbuffers.Offset, browserTzOffset:flatbuffers.Offset, languageOffset:flatbuffers.Offset):flatbuffers.Offset {
   EmailRequestRequest.startEmailRequestRequest(builder);
   EmailRequestRequest.addEmail(builder, emailOffset);
   EmailRequestRequest.addBrowserTz(builder, browserTzOffset);
+  EmailRequestRequest.addLanguage(builder, languageOffset);
   return EmailRequestRequest.endEmailRequestRequest(builder);
 }
 }