refactor: remove dead code and enable noUnusedLocals (#292)

* refactor: remove dead code and enable noUnusedLocals

- delete launcher/jimaku.ts and the launcher Args/config jimaku* fields
  that only fed it (the SUBMINER_JIMAKU_* env vars had no effect)
- delete plugin/subminer/hover.lua; nothing has sent subminer-hover-token
  since Overlay 2.0
- drop never-read anilist.characterDictionary.refreshTtlHours and
  evictionPolicy (still hidden in the settings UI for old configs)
- drop unused root deps: eslint, @fontsource-variable/geist{,-mono}
  (stats/ declares its own)
- delete the committed draft renderer-performance plan doc
- turn on noUnusedLocals for typecheck and remove what it surfaced,
  including Windows focus-handoff values computed but never consumed

* docs(changes): add docs fragment and note retired hover messages

src/config/definitions/defaults-integrations.ts

@@ -133,9 +133,7 @@ export const INTEGRATIONS_DEFAULT_CONFIG: Pick<
     enabled: false,
     accessToken: '',
     characterDictionary: {
-      refreshTtlHours: 168,
       maxLoaded: 3,
-      evictionPolicy: 'delete',
       profileScope: 'all',
       collapsibleSections: {
         description: false,