thread launcher config dir through app control and overlay calls

- startOverlay and isRunningAppControlServerAvailable accept explicit configDir to avoid re-resolving from env mid-flight
- emit connection-change on reconnect when previously connected
- handle errored client sockets in app control server with logWarn and destroy

launcher/commands/playback-command.test.ts

@@ -1,6 +1,9 @@
 import test from 'node:test';
 import assert from 'node:assert/strict';
 import { EventEmitter } from 'node:events';
+import fs from 'node:fs';
+import os from 'node:os';
+import path from 'node:path';
 import type { LauncherCommandContext } from './context.js';
 import { runPlaybackCommandWithDeps } from './playback-command.js';
 import { state } from '../mpv.js';
@@ -271,6 +274,68 @@ test('plugin auto-start playback attaches a warm background app through the laun
   );
 });
 
+test('plugin auto-start attach mode reuses launcher-resolved config dir for app control', async () => {
+  const context = createContext();
+  const originalXdgConfigHome = process.env.XDG_CONFIG_HOME;
+  const xdgConfigHome = fs.mkdtempSync(path.join(os.tmpdir(), 'subminer-test-xdg-'));
+  const expectedConfigDir = path.join(xdgConfigHome, 'SubMiner');
+  fs.mkdirSync(expectedConfigDir, { recursive: true });
+  fs.writeFileSync(path.join(expectedConfigDir, 'config.jsonc'), '{}');
+  context.args = {
+    ...context.args,
+    target: '/tmp/movie.mkv',
+    targetKind: 'file',
+    useTexthooker: true,
+  };
+  context.pluginRuntimeConfig = {
+    socketPath: '/tmp/subminer.sock',
+    binaryPath: '',
+    backend: 'auto',
+    autoStart: true,
+    autoStartVisibleOverlay: true,
+    autoStartPauseUntilReady: true,
+    texthookerEnabled: true,
+    aniskipEnabled: true,
+    aniskipButtonKey: 'TAB',
+  };
+  let availabilityConfigDir: string | undefined;
+  let overlayConfigDir: string | undefined;
+
+  try {
+    process.env.XDG_CONFIG_HOME = xdgConfigHome;
+
+    await runPlaybackCommandWithDeps(context, {
+      ensurePlaybackSetupReady: async () => {},
+      chooseTarget: async () => ({ target: context.args.target, kind: 'file' }),
+      checkDependencies: () => {},
+      registerCleanup: () => {},
+      startMpv: async () => {},
+      waitForUnixSocketReady: async () => true,
+      startOverlay: async (_appPath, _args, _socketPath, _extraAppArgs = [], configDir) => {
+        overlayConfigDir = configDir;
+      },
+      launchAppCommandDetached: () => {},
+      log: () => {},
+      cleanupPlaybackSession: async () => {},
+      getMpvProc: () => null,
+      isAppControlServerAvailable: async (_logLevel, configDir) => {
+        availabilityConfigDir = configDir;
+        return true;
+      },
+    });
+
+    assert.equal(availabilityConfigDir, expectedConfigDir);
+    assert.equal(overlayConfigDir, expectedConfigDir);
+  } finally {
+    if (originalXdgConfigHome === undefined) {
+      delete process.env.XDG_CONFIG_HOME;
+    } else {
+      process.env.XDG_CONFIG_HOME = originalXdgConfigHome;
+    }
+    fs.rmSync(xdgConfigHome, { recursive: true, force: true });
+  }
+});
+
 test('plugin auto-start attach mode omits texthooker flag when CLI texthooker is disabled', async () => {
   const context = createContext();
   context.args = {

launcher/commands/playback-command.ts

@@ -30,6 +30,13 @@ import { hasLauncherExternalYomitanProfileConfig } from '../config.js';
 const SETUP_WAIT_TIMEOUT_MS = 10 * 60 * 1000;
 const SETUP_POLL_INTERVAL_MS = 500;
 
+function getLauncherConfigDir(): string {
+  return getDefaultConfigDir({
+    xdgConfigHome: process.env.XDG_CONFIG_HOME,
+    homeDir: os.homedir(),
+  });
+}
+
 function checkDependencies(args: Args): void {
   const missing: string[] = [];
 
@@ -100,10 +107,7 @@ async function ensurePlaybackSetupReady(context: LauncherCommandContext): Promis
   const { args, appPath } = context;
   if (!appPath) return;
 
-  const configDir = getDefaultConfigDir({
-    xdgConfigHome: process.env.XDG_CONFIG_HOME,
-    homeDir: os.homedir(),
-  });
+  const configDir = getLauncherConfigDir();
   const statePath = getSetupStatePath(configDir);
   const ready = await ensureLauncherSetupReady({
     readSetupState: () => readSetupState(statePath),
@@ -166,7 +170,7 @@ type PlaybackCommandDeps = {
   waitForUnixSocketReady: typeof waitForUnixSocketReady;
   startOverlay: typeof startOverlay;
   launchAppCommandDetached: typeof launchAppCommandDetached;
-  isAppControlServerAvailable?: (logLevel: Args['logLevel']) => Promise<boolean>;
+  isAppControlServerAvailable?: (logLevel: Args['logLevel'], configDir: string) => Promise<boolean>;
   log: typeof log;
   cleanupPlaybackSession: typeof cleanupPlaybackSession;
   getMpvProc: () => typeof state.mpvProc;
@@ -211,6 +215,7 @@ export async function runPlaybackCommandWithDeps(
   const isYoutubeUrl = selectedTarget.kind === 'url' && isYoutubeTarget(selectedTarget.target);
   const isAppOwnedYoutubeFlow = isYoutubeUrl;
   const youtubeMode = args.youtubeMode ?? 'download';
+  const configDir = getLauncherConfigDir();
 
   if (isYoutubeUrl) {
     deps.log('info', args.logLevel, 'YouTube subtitle flow: app-owned picker after mpv bootstrap');
@@ -222,7 +227,7 @@ export async function runPlaybackCommandWithDeps(
     !args.startOverlay &&
     !args.autoStartOverlay &&
     !isAppOwnedYoutubeFlow &&
-    ((await deps.isAppControlServerAvailable?.(args.logLevel)) ?? false);
+    ((await deps.isAppControlServerAvailable?.(args.logLevel, configDir)) ?? false);
   const effectivePluginRuntimeConfig = shouldLauncherAttachRunningApp
     ? { ...pluginRuntimeConfig, autoStart: false }
     : pluginRuntimeConfig;
@@ -287,7 +292,7 @@ export async function runPlaybackCommandWithDeps(
               : []),
           ]
         : [];
-    await deps.startOverlay(appPath, args, mpvSocketPath, extraAppArgs);
+    await deps.startOverlay(appPath, args, mpvSocketPath, extraAppArgs, configDir);
   } else if (pluginAutoStartEnabled) {
     if (ready) {
       deps.log('info', args.logLevel, 'MPV IPC socket ready, relying on mpv plugin auto-start');