refactor(ipc): remove dead preload methods and the ASS line broadcast (#293)

Drop 16 overlay preload methods with no caller (onSubtitleAss,
getCurrentSubtitleAss, onVisibility, getOverlayVisibility,
openYomitanSettings, quitApp, toggleOverlay, getMecabStatus,
setMecabEnabled, getKeybindings, saveControllerPreference,
getAnkiConnectStatus, setAnkiConnectEnabled, clearAnkiConnectHistory,
cycleRuntimeOption, appendClipboardVideoToQueue) along with their
IPC_CHANNELS keys, handlers, validators and dep plumbing.

With both ASS consumers gone, stop observing sub-text/ass in mpv and
remove the subtitle-ass-change event chain and appState.currentSubAssText.
The main-process functions these wrapped stay; tray, CLI, shortcuts and
session actions still use them.

src/main/ipc-runtime.ts

@@ -15,7 +15,7 @@ import {
 
 export interface RegisterIpcRuntimeServicesParams {
   runtimeOptions: RuntimeOptionsIpcDepsParams;
-  mainDeps: Omit<MainIpcRuntimeServiceDepsParams, 'setRuntimeOption' | 'cycleRuntimeOption'>;
+  mainDeps: Omit<MainIpcRuntimeServiceDepsParams, 'setRuntimeOption'>;
   ankiJimakuDeps: AnkiJimakuIpcRuntimeServiceDepsParams;
 }
 
@@ -40,7 +40,6 @@ export function registerIpcRuntimeServices(params: RegisterIpcRuntimeServicesPar
   registerMainIpcRuntimeServices({
     ...params.mainDeps,
     setRuntimeOption: runtimeOptionsIpcDeps.setRuntimeOption,
-    cycleRuntimeOption: runtimeOptionsIpcDeps.cycleRuntimeOption,
   });
   registerAnkiJimakuIpcRuntimeServices(params.ankiJimakuDeps);
 }