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/types/integrations.ts

@@ -50,7 +50,6 @@ export interface JimakuConfig {
   maxEntryResults?: number;
 }
 
-export type AnilistCharacterDictionaryEvictionPolicy = 'disable' | 'delete';
 export type AnilistCharacterDictionaryProfileScope = 'all' | 'active';
 export type AnilistCharacterDictionaryCollapsibleSectionKey =
   | 'description'
@@ -64,9 +63,7 @@ export interface AnilistCharacterDictionaryCollapsibleSectionsConfig {
 }
 
 export interface AnilistCharacterDictionaryConfig {
-  refreshTtlHours?: number;
   maxLoaded?: number;
-  evictionPolicy?: AnilistCharacterDictionaryEvictionPolicy;
   profileScope?: AnilistCharacterDictionaryProfileScope;
   collapsibleSections?: AnilistCharacterDictionaryCollapsibleSectionsConfig;
 }