fix(theme): mirror bounded cookie propagation reconciliation

components/theme-client.php

@@ -44,6 +44,24 @@ $themeSurface = isset($themeSurface) && in_array($themeSurface, ['public', 'priv
         return hex.slice(0, 8) + '-' + hex.slice(8, 12) + '-' + hex.slice(12, 16) + '-' + hex.slice(16, 20) + '-' + hex.slice(20);
     }
     function refresh() { const value = read(); apply(value ? themeOf(value) : shown); }
+    const storageTimers = {soon: null, settled: null, trailing: null};
+    function refreshAfterStorage() {
+        refresh();
+        // Между процессами storage notification может прийти раньше cookie.
+        // Только повторно читаем authority: event.newValue не задаёт порядок выбора.
+        const schedule = (slot, delay) => {
+            storageTimers[slot] = window.setTimeout(() => {
+                storageTimers[slot] = null;
+                refresh();
+            }, delay);
+        };
+        if (storageTimers.soon === null) schedule('soon', 0);
+        if (storageTimers.settled === null) schedule('settled', 50);
+        // Новое notification получает собственное trailing окно; ранние passes
+        // не перезапускаются. Максимум три timers, после тишины повторов нет.
+        if (storageTimers.trailing !== null) window.clearTimeout(storageTimers.trailing);
+        schedule('trailing', 250);
+    }
     function choose(theme) {
         if (theme !== 'light' && theme !== 'dark') return;
         const from = shown;
@@ -66,7 +84,7 @@ $themeSurface = isset($themeSurface) && in_array($themeSurface, ['public', 'priv
         const button = event.target instanceof Element ? event.target.closest('[data-theme-choice]') : null;
         if (button && !button.disabled) choose(button.dataset.themeChoice);
     });
-    window.addEventListener('storage', event => { if (event.key === key || event.key === null) refresh(); });
+    window.addEventListener('storage', event => { if (event.key === key || event.key === null) refreshAfterStorage(); });
     window.addEventListener('pageshow', refresh);
     document.addEventListener('DOMContentLoaded', refresh);
     document.addEventListener('pjax:end', refresh);