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-loksyu-app.html

@@ -0,0 +1,55 @@
+{{!-- Loksyu standalone app --}}
+<div class="cde-loksyu-app-body">
+
+  {{#unless hasActor}}
+  <p class="cde-empty-list"><i class="fas fa-exclamation-triangle"></i> {{ localize "CDE.LoksyuNotFound" }}</p>
+  {{/unless}}
+
+  {{#if hasActor}}
+  <div class="cde-loksyu-elements">
+    {{#each elements as |el|}}
+    <div class="cde-lok-card cde-lok-card--{{el.key}}">
+      <div class="cde-lok-header">
+        <img class="cde-lok-icon" src="{{el.img}}" alt="{{localize el.nameKey}}" width="32" height="32" />
+        <div class="cde-lok-titles">
+          <span class="cde-lok-name">{{ localize el.nameKey }}</span>
+          <span class="cde-lok-qual">{{ localize el.qualKey }}</span>
+        </div>
+        <a class="cde-lok-reset" data-action="resetElement" data-element="{{el.key}}" title="{{ localize 'CDE.Reset' }}">
+          <i class="fas fa-rotate-left"></i>
+        </a>
+      </div>
+      <div class="cde-lok-values">
+        <div class="cde-lok-polarity cde-lok-polarity--yang">
+          <span class="cde-lok-pol-label">○ {{ localize "CDE.Yang" }}</span>
+          <input class="cde-lok-input" type="number" min="0"
+            data-field="system.{{el.key}}.yang.value"
+            value="{{el.yang}}"
+            {{#unless ../canEdit}}disabled{{/unless}} />
+        </div>
+        <div class="cde-lok-polarity cde-lok-polarity--yin">
+          <span class="cde-lok-pol-label">● {{ localize "CDE.Yin" }}</span>
+          <input class="cde-lok-input" type="number" min="0"
+            data-field="system.{{el.key}}.yin.value"
+            value="{{el.yin}}"
+            {{#unless ../canEdit}}disabled{{/unless}} />
+        </div>
+      </div>
+    </div>
+    {{/each}}
+  </div>
+
+  <div class="cde-loksyu-visual-row">
+    <img class="cde-lok-visual" src="systems/fvtt-chroniques-de-l-etrange/images/loksyu_long.webp" alt="Loksyu" />
+  </div>
+
+  {{#if canEdit}}
+  <div class="cde-lok-footer">
+    <button class="cde-lok-reset-all" data-action="resetAll">
+      <i class="fas fa-rotate-left"></i> {{ localize "CDE.ResetAll" }}
+    </button>
+  </div>
+  {{/if}}
+  {{/if}}
+
+</div>