refactor(launcher): extract types, logging, and utilities

- launcher/types.ts: shared types, interfaces, and constants
- launcher/log.ts: logging infrastructure (COLORS, log, fail, etc.)
- launcher/util.ts: pure utilities, lang helpers, and child process runner
- runExternalCommand accepts childTracker param instead of referencing state
- inferWhisperLanguage placed in util.ts to avoid circular deps

launcher/types.ts

@@ -0,0 +1,188 @@
+import path from "node:path";
+import os from "node:os";
+
+export const VIDEO_EXTENSIONS = new Set([
+  "mkv",
+  "mp4",
+  "avi",
+  "webm",
+  "mov",
+  "flv",
+  "wmv",
+  "m4v",
+  "ts",
+  "m2ts",
+]);
+
+export const ROFI_THEME_FILE = "subminer.rasi";
+export const DEFAULT_SOCKET_PATH = "/tmp/subminer-socket";
+export const DEFAULT_YOUTUBE_PRIMARY_SUB_LANGS = ["ja", "jpn"];
+export const DEFAULT_YOUTUBE_SECONDARY_SUB_LANGS = ["en", "eng"];
+export const YOUTUBE_SUB_EXTENSIONS = new Set([".srt", ".vtt", ".ass"]);
+export const YOUTUBE_AUDIO_EXTENSIONS = new Set([
+  ".m4a",
+  ".mp3",
+  ".webm",
+  ".opus",
+  ".wav",
+  ".aac",
+  ".flac",
+]);
+export const DEFAULT_YOUTUBE_SUBGEN_OUT_DIR = path.join(
+  os.homedir(),
+  ".cache",
+  "subminer",
+  "youtube-subs",
+);
+export const DEFAULT_MPV_LOG_FILE = path.join(
+  os.homedir(),
+  ".cache",
+  "SubMiner",
+  "mp.log",
+);
+export const DEFAULT_YOUTUBE_YTDL_FORMAT = "bestvideo*+bestaudio/best";
+export const DEFAULT_JIMAKU_API_BASE_URL = "https://jimaku.cc";
+export const DEFAULT_MPV_SUBMINER_ARGS = [
+  "--sub-auto=fuzzy",
+  "--sub-file-paths=.;subs;subtitles",
+  "--sid=auto",
+  "--secondary-sid=auto",
+  "--secondary-sub-visibility=no",
+  "--slang=ja,jpn,en,eng",
+] as const;
+
+export type LogLevel = "debug" | "info" | "warn" | "error";
+export type YoutubeSubgenMode = "automatic" | "preprocess" | "off";
+export type Backend = "auto" | "hyprland" | "x11" | "macos";
+export type JimakuLanguagePreference = "ja" | "en" | "none";
+
+export interface Args {
+  backend: Backend;
+  directory: string;
+  recursive: boolean;
+  profile: string;
+  startOverlay: boolean;
+  youtubeSubgenMode: YoutubeSubgenMode;
+  whisperBin: string;
+  whisperModel: string;
+  youtubeSubgenOutDir: string;
+  youtubeSubgenAudioFormat: string;
+  youtubeSubgenKeepTemp: boolean;
+  youtubePrimarySubLangs: string[];
+  youtubeSecondarySubLangs: string[];
+  youtubeAudioLangs: string[];
+  youtubeWhisperSourceLanguage: string;
+  useTexthooker: boolean;
+  autoStartOverlay: boolean;
+  texthookerOnly: boolean;
+  useRofi: boolean;
+  logLevel: LogLevel;
+  target: string;
+  targetKind: "" | "file" | "url";
+  jimakuApiKey: string;
+  jimakuApiKeyCommand: string;
+  jimakuApiBaseUrl: string;
+  jimakuLanguagePreference: JimakuLanguagePreference;
+  jimakuMaxEntryResults: number;
+  jellyfin: boolean;
+  jellyfinLogin: boolean;
+  jellyfinLogout: boolean;
+  jellyfinPlay: boolean;
+  jellyfinServer: string;
+  jellyfinUsername: string;
+  jellyfinPassword: string;
+}
+
+export interface LauncherYoutubeSubgenConfig {
+  mode?: YoutubeSubgenMode;
+  whisperBin?: string;
+  whisperModel?: string;
+  primarySubLanguages?: string[];
+  secondarySubLanguages?: string[];
+  jimakuApiKey?: string;
+  jimakuApiKeyCommand?: string;
+  jimakuApiBaseUrl?: string;
+  jimakuLanguagePreference?: JimakuLanguagePreference;
+  jimakuMaxEntryResults?: number;
+}
+
+export interface LauncherJellyfinConfig {
+  enabled?: boolean;
+  serverUrl?: string;
+  username?: string;
+  accessToken?: string;
+  userId?: string;
+  defaultLibraryId?: string;
+  pullPictures?: boolean;
+  iconCacheDir?: string;
+}
+
+export interface PluginRuntimeConfig {
+  autoStartOverlay: boolean;
+  socketPath: string;
+}
+
+export interface CommandExecOptions {
+  allowFailure?: boolean;
+  captureStdout?: boolean;
+  logLevel?: LogLevel;
+  commandLabel?: string;
+  streamOutput?: boolean;
+  env?: NodeJS.ProcessEnv;
+}
+
+export interface CommandExecResult {
+  code: number;
+  stdout: string;
+  stderr: string;
+}
+
+export interface SubtitleCandidate {
+  path: string;
+  lang: "primary" | "secondary";
+  ext: string;
+  size: number;
+  source: "manual" | "auto" | "whisper" | "whisper-translate";
+}
+
+export interface YoutubeSubgenOutputs {
+  basename: string;
+  primaryPath?: string;
+  secondaryPath?: string;
+}
+
+export interface MpvTrack {
+  type?: string;
+  id?: number;
+  lang?: string;
+  title?: string;
+}
+
+export interface JellyfinSessionConfig {
+  serverUrl: string;
+  accessToken: string;
+  userId: string;
+  defaultLibraryId: string;
+  pullPictures: boolean;
+  iconCacheDir: string;
+}
+
+export interface JellyfinLibraryEntry {
+  id: string;
+  name: string;
+  kind: string;
+}
+
+export interface JellyfinItemEntry {
+  id: string;
+  name: string;
+  type: string;
+  display: string;
+}
+
+export interface JellyfinGroupEntry {
+  id: string;
+  name: string;
+  type: string;
+  display: string;
+}