feat(subsync): add replace option and deterministic retimed naming

src/config/definitions/defaults-core.ts

@@ -50,6 +50,7 @@ export const CORE_DEFAULT_CONFIG: Pick<
     alass_path: '',
     ffsubsync_path: '',
     ffmpeg_path: '',
+    replace: true,
   },
   startupWarmups: {
     lowPowerMode: false,

src/config/definitions/options-core.ts

@@ -32,6 +32,12 @@ export function buildCoreConfigOptionRegistry(
       defaultValue: defaultConfig.subsync.defaultMode,
       description: 'Subsync default mode.',
     },
+    {
+      path: 'subsync.replace',
+      kind: 'boolean',
+      defaultValue: defaultConfig.subsync.replace,
+      description: 'Replace the active subtitle file when sync completes.',
+    },
     {
       path: 'startupWarmups.lowPowerMode',
       kind: 'boolean',