Move toju-app into own its folder

toju-app/src/app/domains/attachment/domain/attachment-transfer.constants.ts

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+/** Size (bytes) of each chunk when streaming a file over RTCDataChannel. */
+export const FILE_CHUNK_SIZE_BYTES = 64 * 1024; // 64 KB
+
+/**
+ * EWMA smoothing weight for the previous speed estimate.
+ * The complementary weight is applied to the latest sample.
+ */
+export const ATTACHMENT_TRANSFER_EWMA_PREVIOUS_WEIGHT = 0.7;
+export const ATTACHMENT_TRANSFER_EWMA_CURRENT_WEIGHT = 1 - ATTACHMENT_TRANSFER_EWMA_PREVIOUS_WEIGHT;
+
+/** Fallback MIME type when none is provided by the sender. */
+export const DEFAULT_ATTACHMENT_MIME_TYPE = 'application/octet-stream';
+
+/** localStorage key used by the legacy attachment store during migration. */
+export const LEGACY_ATTACHMENTS_STORAGE_KEY = 'metoyou_attachments';
+
+/** User-facing error when no peers are available for a request. */
+export const NO_CONNECTED_PEERS_REQUEST_ERROR = 'No connected peers are available to provide this file right now.';
+
+/** User-facing error when connected peers cannot provide a requested file. */
+export const FILE_NOT_FOUND_REQUEST_ERROR = 'The connected peers do not have this file right now.';

toju-app/src/app/domains/attachment/domain/attachment-transfer.models.ts

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+import type { ChatEvent } from '../../../shared-kernel';
+import type { ChatAttachmentAnnouncement } from '../../../shared-kernel';
+
+export type FileAnnounceEvent = ChatEvent & {
+  type: 'file-announce';
+  messageId: string;
+  file: ChatAttachmentAnnouncement;
+};
+
+export type FileChunkEvent = ChatEvent & {
+  type: 'file-chunk';
+  messageId: string;
+  fileId: string;
+  index: number;
+  total: number;
+  data: string;
+  fromPeerId?: string;
+};
+
+export type FileRequestEvent = ChatEvent & {
+  type: 'file-request';
+  messageId: string;
+  fileId: string;
+  fromPeerId?: string;
+};
+
+export type FileCancelEvent = ChatEvent & {
+  type: 'file-cancel';
+  messageId: string;
+  fileId: string;
+  fromPeerId?: string;
+};
+
+export type FileNotFoundEvent = ChatEvent & {
+  type: 'file-not-found';
+  messageId: string;
+  fileId: string;
+};
+
+export type FileAnnouncePayload = Pick<ChatEvent, 'messageId' | 'file'>;
+
+export interface FileChunkPayload {
+  messageId?: string;
+  fileId?: string;
+  fromPeerId?: string;
+  index?: number;
+  total?: number;
+  data?: ChatEvent['data'];
+}
+
+export type FileRequestPayload = Pick<ChatEvent, 'messageId' | 'fileId' | 'fromPeerId'>;
+export type FileCancelPayload = Pick<ChatEvent, 'messageId' | 'fileId' | 'fromPeerId'>;
+export type FileNotFoundPayload = Pick<ChatEvent, 'messageId' | 'fileId'>;
+
+export type LocalFileWithPath = File & {
+  path?: string;
+};

toju-app/src/app/domains/attachment/domain/attachment.constants.ts

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+/** Maximum file size (bytes) that is automatically saved or pushed for inline previews. */
+export const MAX_AUTO_SAVE_SIZE_BYTES = 10 * 1024 * 1024; // 10 MB

toju-app/src/app/domains/attachment/domain/attachment.logic.ts

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+import { MAX_AUTO_SAVE_SIZE_BYTES } from './attachment.constants';
+import type { Attachment } from './attachment.models';
+
+export function isAttachmentMedia(attachment: Pick<Attachment, 'mime'>): boolean {
+  return attachment.mime.startsWith('image/') ||
+    attachment.mime.startsWith('video/') ||
+    attachment.mime.startsWith('audio/');
+}
+
+export function shouldAutoRequestWhenWatched(attachment: Attachment): boolean {
+  return attachment.isImage ||
+    (isAttachmentMedia(attachment) && attachment.size <= MAX_AUTO_SAVE_SIZE_BYTES);
+}
+
+export function shouldPersistDownloadedAttachment(attachment: Pick<Attachment, 'size' | 'mime'>): boolean {
+  return attachment.size <= MAX_AUTO_SAVE_SIZE_BYTES ||
+    attachment.mime.startsWith('video/') ||
+    attachment.mime.startsWith('audio/');
+}

toju-app/src/app/domains/attachment/domain/attachment.models.ts

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+import type { ChatAttachmentMeta } from '../../../shared-kernel';
+
+export type AttachmentMeta = ChatAttachmentMeta;
+
+export interface Attachment extends AttachmentMeta {
+  available: boolean;
+  objectUrl?: string;
+  receivedBytes?: number;
+  speedBps?: number;
+  startedAtMs?: number;
+  lastUpdateMs?: number;
+  requestError?: string;
+}