refactor: consolidate IPC types into src/shared/types.ts

The 12 cross-process data types were manually copied across
src/preload/index.ts and src/renderer/src/types/t4sd.d.ts. A silent
field addition or rename in either file would not produce a compile
error in the other — the divergence only surfaces at runtime.

A shared module makes the compiler enforce consistency. Preload imports
from shared/types and re-exports for downstream consumers. The renderer's
t4sd.d.ts re-exports the same types from shared/types, so all existing
screen imports continue to work without modification.

Both tsconfigs are extended to include src/shared so the module is
reachable from both composite projects.

src/main/playback/types.ts

@@ -8,10 +8,4 @@ export type Quality =
   | 'audio_only'
   | 'worst'
 
-export interface PlaybackEvent {
-  kind: 'started' | 'stopped' | 'error'
-  channelLogin?: string
-  message?: string
-  durationSeconds?: number
-  isLive?: boolean
-}
+export type { PlaybackEvent } from '../../shared/types'

src/preload/index.ts

@@ -1,91 +1,33 @@
 import { contextBridge, ipcRenderer, type IpcRendererEvent } from 'electron'
 import { IPC } from '../main/ipc/channels'
+import type {
+  AuthStatus,
+  DeviceFlowStartInfo,
+  AuthEvent,
+  FollowedChannelInfo,
+  OwnUserInfo,
+  PlaybackEvent,
+  HlsUrlPayload,
+  GameInfo,
+  VodInfo,
+  VodProgress,
+  VodChapter,
+  TopStreamsResult
+} from '../shared/types'
 
-export type AuthStatus = 'logged-out' | 'logged-in'
-
-export interface DeviceFlowStartInfo {
-  userCode: string
-  verificationUri: string
-  expiresInSec: number
-}
-
-export type AuthEvent =
-  | { kind: 'authorized' }
-  | { kind: 'denied' }
-  | { kind: 'expired' }
-  | { kind: 'cancelled' }
-  | { kind: 'error'; message: string }
-
-export interface FollowedChannelInfo {
-  broadcasterId: string
-  broadcasterLogin: string
-  broadcasterName: string
-  profileImageUrl: string
-  isLive: boolean
-  streamTitle?: string
-  gameId?: string
-  gameName?: string
-  viewerCount?: number
-  thumbnailUrl?: string
-  startedAt?: string
-  language?: string
-}
-
-export interface OwnUserInfo {
-  id: string
-  login: string
-  displayName: string
-  profileImageUrl: string
-}
-
-export interface PlaybackEvent {
-  kind: 'started' | 'stopped' | 'error'
-  channelLogin?: string
-  message?: string
-  durationSeconds?: number
-  isLive?: boolean
-}
-
-export interface HlsUrlPayload {
-  url: string
-  isLive: boolean
-  startPosition: number
-  durationSeconds: number
-  vodId?: string
-}
-
-export interface GameInfo {
-  id: string
-  name: string
-  boxArtUrl: string
-  viewerCount?: number
-}
-
-export interface VodInfo {
-  id: string
-  title: string
-  createdAt: string
-  durationSeconds: number
-  viewCount: number
-  thumbnailUrl: string
-}
-
-export interface VodProgress {
-  resumePositionSeconds: number
-  watchedAt: number
-  completed: boolean
-}
-
-export interface VodChapter {
-  positionSeconds: number
-  durationSeconds: number
-  gameName: string
-  gameId: string | null
-}
-
-export interface TopStreamsResult {
-  streams: FollowedChannelInfo[]
-  cursor?: string
+export type {
+  AuthStatus,
+  DeviceFlowStartInfo,
+  AuthEvent,
+  FollowedChannelInfo,
+  OwnUserInfo,
+  PlaybackEvent,
+  HlsUrlPayload,
+  GameInfo,
+  VodInfo,
+  VodProgress,
+  VodChapter,
+  TopStreamsResult
 }
 
 const api = {

src/renderer/src/types/t4sd.d.ts

@@ -1,92 +1,37 @@
-// Spiegel der Preload-API. Manuell synchron halten zu src/preload/index.ts.
-// IPC-Channel-Namen: src/main/ipc/channels.ts (Renderer kann nicht direkt importieren).
+// Data types: src/shared/types.ts (canonical source, compiler-enforced).
+// T4sdApi: keep manually in sync with src/preload/index.ts.
+// Direct import is not possible: tsconfig.web.json and tsconfig.node.json are separate
+// composite projects — preload/index.ts is not reachable from the renderer build.
 
-export type AuthStatus = 'logged-out' | 'logged-in'
+export type {
+  AuthStatus,
+  DeviceFlowStartInfo,
+  AuthEvent,
+  FollowedChannelInfo,
+  OwnUserInfo,
+  PlaybackEvent,
+  HlsUrlPayload,
+  GameInfo,
+  VodInfo,
+  VodProgress,
+  VodChapter,
+  TopStreamsResult
+} from '../../../shared/types'
 
-export interface DeviceFlowStartInfo {
-  userCode: string
-  verificationUri: string
-  expiresInSec: number
-}
-
-export type AuthEvent =
-  | { kind: 'authorized' }
-  | { kind: 'denied' }
-  | { kind: 'expired' }
-  | { kind: 'cancelled' }
-  | { kind: 'error'; message: string }
-
-export interface FollowedChannelInfo {
-  broadcasterId: string
-  broadcasterLogin: string
-  broadcasterName: string
-  profileImageUrl: string
-  isLive: boolean
-  streamTitle?: string
-  gameId?: string
-  gameName?: string
-  viewerCount?: number
-  thumbnailUrl?: string
-  startedAt?: string
-  language?: string
-}
-
-export interface OwnUserInfo {
-  id: string
-  login: string
-  displayName: string
-  profileImageUrl: string
-}
-
-export interface GameInfo {
-  id: string
-  name: string
-  boxArtUrl: string
-  viewerCount?: number
-}
-
-export interface PlaybackEvent {
-  kind: 'started' | 'stopped' | 'error'
-  channelLogin?: string
-  message?: string
-  durationSeconds?: number
-  isLive?: boolean
-}
-
-export interface HlsUrlPayload {
-  url: string
-  isLive: boolean
-  startPosition: number
-  durationSeconds: number
-  vodId?: string
-}
-
-export interface VodInfo {
-  id: string
-  title: string
-  createdAt: string
-  durationSeconds: number
-  viewCount: number
-  thumbnailUrl: string
-}
-
-export interface VodProgress {
-  resumePositionSeconds: number
-  watchedAt: number
-  completed: boolean
-}
-
-export interface VodChapter {
-  positionSeconds: number
-  durationSeconds: number
-  gameName: string
-  gameId: string | null
-}
-
-export interface TopStreamsResult {
-  streams: FollowedChannelInfo[]
-  cursor?: string
-}
+import type {
+  AuthStatus,
+  DeviceFlowStartInfo,
+  AuthEvent,
+  FollowedChannelInfo,
+  OwnUserInfo,
+  PlaybackEvent,
+  HlsUrlPayload,
+  GameInfo,
+  VodInfo,
+  VodProgress,
+  VodChapter,
+  TopStreamsResult
+} from '../../../shared/types'
 
 export interface T4sdApi {
   appVersion: string

src/shared/types.ts

@@ -0,0 +1,86 @@
+export type AuthStatus = 'logged-out' | 'logged-in'
+
+export interface DeviceFlowStartInfo {
+  userCode: string
+  verificationUri: string
+  expiresInSec: number
+}
+
+export type AuthEvent =
+  | { kind: 'authorized' }
+  | { kind: 'denied' }
+  | { kind: 'expired' }
+  | { kind: 'cancelled' }
+  | { kind: 'error'; message: string }
+
+export interface FollowedChannelInfo {
+  broadcasterId: string
+  broadcasterLogin: string
+  broadcasterName: string
+  profileImageUrl: string
+  isLive: boolean
+  streamTitle?: string
+  gameId?: string
+  gameName?: string
+  viewerCount?: number
+  thumbnailUrl?: string
+  startedAt?: string
+  language?: string
+}
+
+export interface OwnUserInfo {
+  id: string
+  login: string
+  displayName: string
+  profileImageUrl: string
+}
+
+export interface PlaybackEvent {
+  kind: 'started' | 'stopped' | 'error'
+  channelLogin?: string
+  message?: string
+  durationSeconds?: number
+  isLive?: boolean
+}
+
+export interface HlsUrlPayload {
+  url: string
+  isLive: boolean
+  startPosition: number
+  durationSeconds: number
+  vodId?: string
+}
+
+export interface GameInfo {
+  id: string
+  name: string
+  boxArtUrl: string
+  viewerCount?: number
+}
+
+export interface VodInfo {
+  id: string
+  title: string
+  createdAt: string
+  durationSeconds: number
+  viewCount: number
+  thumbnailUrl: string
+}
+
+export interface VodProgress {
+  resumePositionSeconds: number
+  watchedAt: number
+  completed: boolean
+}
+
+export interface VodChapter {
+  positionSeconds: number
+  durationSeconds: number
+  gameName: string
+  gameId: string | null
+}
+
+export interface TopStreamsResult {
+  streams: FollowedChannelInfo[]
+  cursor?: string
+}