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>

templates/apps/cde-tinji-app.html

@@ -0,0 +1,41 @@
+{{!-- Tin Ji standalone app --}}
+<div class="cde-tinji-app-body">
+
+  {{#unless hasActor}}
+  <p class="cde-empty-list"><i class="fas fa-exclamation-triangle"></i> {{ localize "CDE.TinjiNotFound" }}</p>
+  {{/unless}}
+
+  {{#if hasActor}}
+  <div class="cde-tinji-display">
+    <div class="cde-tinji-chinese-large">天機</div>
+    <div class="cde-tinji-label">{{ localize "CDE.UpperCaseTinJi" }}</div>
+
+    <div class="cde-tinji-counter">
+      {{#if canEdit}}
+      <button class="cde-tinji-step" data-action="decrement" title="{{ localize 'CDE.Decrement' }}">−</button>
+      {{/if}}
+      <input class="cde-tinji-direct" type="number" min="0" value="{{value}}"
+        {{#unless canEdit}}disabled{{/unless}} />
+      {{#if canEdit}}
+      <button class="cde-tinji-step" data-action="increment" title="{{ localize 'CDE.Increment' }}">+</button>
+      {{/if}}
+    </div>
+
+    <div class="cde-tinji-hint">{{ localize "CDE.AuspiciousDice" }}</div>
+
+    <div class="cde-tinji-actions">
+      <button class="cde-tinji-spend-btn" data-action="spend" {{#unless value}}disabled{{/unless}}>
+        <i class="fas fa-star"></i> {{ localize "CDE.SpendTinji" }}
+      </button>
+      {{#if canEdit}}
+      <button class="cde-tinji-reset-btn" data-action="reset">
+        <i class="fas fa-rotate-left"></i> {{ localize "CDE.Reset" }}
+      </button>
+      {{/if}}
+    </div>
+  </div>
+
+  <img class="cde-tinji-visual" src="systems/fvtt-chroniques-de-l-etrange/images/tinji.webp" alt="Tin Ji" />
+  {{/if}}
+
+</div>