feat: Loksyu & TinJi standalone AppV2 apps with chat buttons and dice automation

- CDELoksyuApp: standalone HandlebarsApplicationMixin(ApplicationV2) app
  - 5-element Wu Xing grid with yin/yang inputs per element
  - Per-element reset buttons + global reset-all
  - Auto-refresh via updateActor hook

- CDETinjiApp: standalone AppV2 for the collective Tin Ji dice pool
  - Large neon counter with +/- buttons and direct input
  - Spend button sends a chat message with remaining count

- singletons.js: shared utilities
  - getSingletonActor: find or auto-create singleton actor
  - updateLoksyuFromRoll: compute lokAspect from Wu Xing cycle, update yin/yang
  - updateTinjiFromRoll: add tinji face count to value

- rolling.js: auto-update both singletons after every dice roll
  (weapon path + main roll path)

- system.js: renderChatLog hook injects Loksyu/TinJi footer buttons
  in the chat sidebar

- loksyu.js / tinji.js: actor sheets redirect to standalone apps
  when opened via the sidebar

- CSS: .cde-loksyu-standalone, .cde-tinji-standalone, .cde-chat-app-buttons,
  .cde-tinji-spend-msg styles added

- i18n: new keys in fr-cde.json and en-cde.json for all new UI strings
  (LoksyuNotFound, TinjiNotFound, Reset, ResetAll, SpendTinji, etc.)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

src/ui/sheets/actors/loksyu.js

@@ -1,4 +1,5 @@
 import { CDEBaseActorSheet } from "./base.js"
+import { CDELoksyuApp } from "../../apps/loksyu-app.js"
 
 export class CDELoksyuSheet extends CDEBaseActorSheet {
   static DEFAULT_OPTIONS = {
@@ -10,4 +11,11 @@ export class CDELoksyuSheet extends CDEBaseActorSheet {
   }
 
   tabGroups = { primary: "loksyu" }
+
+  /** Redirect any direct actor-sheet open to the standalone app instead */
+  async _onFirstRender(context, options) {
+    // Close this actor sheet immediately and open the standalone app
+    await this.close({ animate: false })
+    CDELoksyuApp.open()
+  }
 }