feat(email-templates): group Templates UI by category with core sub-sections

frontend/src/i18n/locales/de.json

@@ -2235,7 +2235,14 @@
       "billing": "Rechnungen"
     },
     "featureOff": "Funktion aus",
-    "featureOffTooltip": "Die zugehörige Funktion ist derzeit deaktiviert. Du kannst die Vorlage trotzdem bearbeiten — sie wird verwendet, sobald die Funktion wieder aktiviert ist."
+    "featureOffTooltip": "Die zugehörige Funktion ist derzeit deaktiviert. Du kannst die Vorlage trotzdem bearbeiten — sie wird verwendet, sobald die Funktion wieder aktiviert ist.",
+    "subcategories": {
+      "gallery": "Galerien",
+      "admin": "Admin-Konten",
+      "backup": "Backup & Wiederherstellung",
+      "system": "System-Updates",
+      "other": "Sonstige"
+    }
   },
   "cms": {
     "title": "CMS-Seiten",

frontend/src/i18n/locales/en.json

@@ -1889,7 +1889,14 @@
       "billing": "Billing"
     },
     "featureOff": "Feature off",
-    "featureOffTooltip": "The feature this template belongs to is currently disabled. You can still edit the template — it will be used once the feature is re-enabled."
+    "featureOffTooltip": "The feature this template belongs to is currently disabled. You can still edit the template — it will be used once the feature is re-enabled.",
+    "subcategories": {
+      "gallery": "Galleries",
+      "admin": "Admin accounts",
+      "backup": "Backup & restore",
+      "system": "System updates",
+      "other": "Other"
+    }
   },
   "cms": {
     "title": "CMS Pages",

frontend/src/i18n/locales/fr.json

@@ -1835,7 +1835,14 @@
       "billing": "Facturation"
     },
     "featureOff": "Fonction désactivée",
-    "featureOffTooltip": "La fonctionnalité à laquelle appartient ce modèle est actuellement désactivée. Vous pouvez toujours modifier le modèle — il sera utilisé une fois la fonctionnalité réactivée."
+    "featureOffTooltip": "La fonctionnalité à laquelle appartient ce modèle est actuellement désactivée. Vous pouvez toujours modifier le modèle — il sera utilisé une fois la fonctionnalité réactivée.",
+    "subcategories": {
+      "gallery": "Galeries",
+      "admin": "Comptes administrateurs",
+      "backup": "Sauvegarde & restauration",
+      "system": "Mises à jour système",
+      "other": "Autres"
+    }
   },
   "cms": {
     "title": "Pages CMS",

frontend/src/i18n/locales/nl.json

@@ -1889,7 +1889,14 @@
       "billing": "Facturatie"
     },
     "featureOff": "Functie uit",
-    "featureOffTooltip": "De functie waar deze sjabloon bij hoort, is momenteel uitgeschakeld. U kunt de sjabloon nog steeds bewerken — deze wordt gebruikt zodra de functie weer is ingeschakeld."
+    "featureOffTooltip": "De functie waar deze sjabloon bij hoort, is momenteel uitgeschakeld. U kunt de sjabloon nog steeds bewerken — deze wordt gebruikt zodra de functie weer is ingeschakeld.",
+    "subcategories": {
+      "gallery": "Galerijen",
+      "admin": "Adminaccounts",
+      "backup": "Back-up & herstel",
+      "system": "Systeemupdates",
+      "other": "Overige"
+    }
   },
   "cms": {
     "title": "CMS-pagina's",

frontend/src/i18n/locales/pt.json

@@ -1914,7 +1914,14 @@
       "billing": "Faturamento"
     },
     "featureOff": "Recurso desativado",
-    "featureOffTooltip": "O recurso ao qual este modelo pertence está atualmente desativado. Você ainda pode editar o modelo — ele será usado assim que o recurso for reativado."
+    "featureOffTooltip": "O recurso ao qual este modelo pertence está atualmente desativado. Você ainda pode editar o modelo — ele será usado assim que o recurso for reativado.",
+    "subcategories": {
+      "gallery": "Galerias",
+      "admin": "Contas de administrador",
+      "backup": "Backup & restauração",
+      "system": "Atualizações do sistema",
+      "other": "Outros"
+    }
   },
   "cms": {
     "title": "Páginas CMS",

frontend/src/i18n/locales/ru.json

@@ -1939,7 +1939,14 @@
       "billing": "Счета"
     },
     "featureOff": "Функция выключена",
-    "featureOffTooltip": "Связанная функция в данный момент отключена. Вы по-прежнему можете редактировать шаблон — он будет использоваться после повторного включения функции."
+    "featureOffTooltip": "Связанная функция в данный момент отключена. Вы по-прежнему можете редактировать шаблон — он будет использоваться после повторного включения функции.",
+    "subcategories": {
+      "gallery": "Галереи",
+      "admin": "Учётные записи администраторов",
+      "backup": "Резервное копирование и восстановление",
+      "system": "Системные обновления",
+      "other": "Прочее"
+    }
   },
   "cms": {
     "title": "Страницы CMS",

frontend/src/pages/admin/EmailConfigPage.tsx

@@ -27,11 +27,12 @@ import { SUPPORTED_LANGUAGES } from "../../components/common/LanguageSelector.ts
 import { useFeatureFlags, type FeatureKey } from '../../contexts/FeatureFlagsContext';
 
 /**
- * Template categorisation (migration 098). Order matters — sidebar
+ * Template categorisation (migration 098). Sidebar sections render
- * sections render in this sequence. Empty categories are hidden
+ * in this order. Empty categories are hidden automatically. New
- * automatically. New categories: add the key here, give it an i18n
+ * categories: add the key here, give it an i18n label
- * label below, set `feature_flag` on templates that should chip
+ * (email.categories.<key>), set `feature_flag` on templates that
- * out when the matching flag is off. No other UI changes required.
+ * should chip out when the matching flag is off. No other UI
+ * changes required.
  */
 const CATEGORY_ORDER: readonly string[] = [
   'core',
@@ -41,6 +42,20 @@ const CATEGORY_ORDER: readonly string[] = [
   'billing',
 ] as const;
 
+/**
+ * Sub-categorisation inside `core` (which carries 14 templates and
+ * deserves its own internal headers). Order is the render sequence.
+ * Templates whose subcategory isn't in this list fall through to a
+ * trailing "other" bucket so a forward-compat row never disappears.
+ * Other top-level categories are flat (no sub-sections) for now.
+ */
+const CORE_SUBCATEGORY_ORDER: readonly string[] = [
+  'gallery',
+  'admin',
+  'backup',
+  'system',
+] as const;
+
 const defaultTemplateKeys = [
   {
     key: 'gallery_created',
@@ -741,70 +756,113 @@ export const EmailConfigPage: React.FC = () => {
                 editable, just chip-tagged so the admin knows the
                 feature is dormant. */}
             {(() => {
-              const grouped: Record<string, EmailTemplate[]> = {};
+              // 1. Bucket templates by top-level category (forward-compat:
+              //    unknown categories fall into 'core').
+              const byCategory: Record<string, EmailTemplate[]> = {};
               for (const template of templates) {
                 const cat = CATEGORY_ORDER.includes(template.category || 'core')
                   ? (template.category || 'core')
                   : 'core';
-                (grouped[cat] = grouped[cat] || []).push(template);
+                (byCategory[cat] = byCategory[cat] || []).push(template);
               }
-              const visibleSections = CATEGORY_ORDER.filter((c) => grouped[c]?.length);
+              const visibleCategories = CATEGORY_ORDER.filter((c) => byCategory[c]?.length);
+
+              // 2. Renders a single template button. Pulled out so the
+              //    flat path and the sub-category path share it.
+              const renderTemplate = (template: EmailTemplate) => {
+                const templateInfo = defaultTemplateKeys.find((t) => t.key === template.template_key);
+                const translationCount = getTranslationCount(template);
+                const enTranslation = template.translations?.en;
+                const featureOff = template.feature_flag
+                  ? featureFlags[template.feature_flag as FeatureKey] === false
+                  : false;
+                return (
+                  <button
+                    key={template.template_key}
+                    onClick={() => {
+                      setSelectedTemplateKey(template.template_key);
+                      setEditedTemplate(template);
+                    }}
+                    className={`w-full text-left p-3 rounded-lg transition-colors ${
+                      selectedTemplateKey === template.template_key
+                        ? 'tile-selected'
+                        : 'bg-neutral-50 dark:bg-neutral-700 border-2 border-transparent hover:bg-neutral-100 dark:hover:bg-neutral-600'
+                    }`}
+                  >
+                    <div className="flex items-center justify-between gap-2">
+                      <p className="font-medium text-neutral-900 dark:text-neutral-100 truncate">
+                        {templateInfo?.name || template.template_key}
+                      </p>
+                      <div className="flex items-center gap-1.5 flex-shrink-0">
+                        {featureOff && (
+                          <span
+                            className="text-[10px] uppercase tracking-wider px-1.5 py-0.5 rounded font-semibold bg-amber-100 text-amber-800 dark:bg-amber-900/40 dark:text-amber-200"
+                            title={t('email.featureOffTooltip', 'The feature this template belongs to is currently disabled. You can still edit the template — it will be used once the feature is re-enabled.')}
+                          >
+                            {t('email.featureOff', 'Feature off')}
+                          </span>
+                        )}
+                        <span className="text-xs px-2 py-0.5 rounded-full bg-neutral-200 dark:bg-neutral-600 text-neutral-600 dark:text-neutral-300">
+                          {translationCount}/{SUPPORTED_LANGUAGES.length}
+                        </span>
+                      </div>
+                    </div>
+                    <p className="text-sm text-neutral-500 dark:text-neutral-400 mt-1 truncate">
+                      {enTranslation?.subject || ''}
+                    </p>
+                  </button>
+                );
+              };
 
               return (
                 <div className="space-y-5">
-                  {visibleSections.map((category) => (
+                  {visibleCategories.map((category) => {
-                    <div key={category}>
+                    // Inside 'core' we group templates further by
-                      <h4 className="px-1 mb-2 text-[11px] font-semibold uppercase tracking-wider text-neutral-500 dark:text-neutral-400">
+                    // subcategory so the busy bucket reads cleanly.
-                        {t(`email.categories.${category}`, category)}
+                    // Other categories render their templates flat.
-                      </h4>
+                    if (category === 'core') {
-                      <div className="space-y-2">
+                      const bySub: Record<string, EmailTemplate[]> = {};
-                        {grouped[category].map((template) => {
+                      for (const template of byCategory.core) {
-                          const templateInfo = defaultTemplateKeys.find((t) => t.key === template.template_key);
+                        const sub = CORE_SUBCATEGORY_ORDER.includes(template.subcategory || '')
-                          const translationCount = getTranslationCount(template);
+                          ? (template.subcategory as string)
-                          const enTranslation = template.translations?.en;
+                          : 'other';
-                          const featureOff = template.feature_flag
+                        (bySub[sub] = bySub[sub] || []).push(template);
-                            ? featureFlags[template.feature_flag as FeatureKey] === false
+                      }
-                            : false;
+                      const visibleSubs = [
-                          return (
+                        ...CORE_SUBCATEGORY_ORDER.filter((s) => bySub[s]?.length),
-                            <button
+                        ...(bySub.other?.length ? ['other'] : []),
-                              key={template.template_key}
+                      ];
-                              onClick={() => {
+                      return (
-                                setSelectedTemplateKey(template.template_key);
+                        <div key={category}>
-                                setEditedTemplate(template);
+                          <h4 className="px-1 mb-2 text-[11px] font-semibold uppercase tracking-wider text-neutral-500 dark:text-neutral-400">
-                              }}
+                            {t(`email.categories.${category}`, category)}
-                              className={`w-full text-left p-3 rounded-lg transition-colors ${
+                          </h4>
-                                selectedTemplateKey === template.template_key
+                          <div className="space-y-4 pl-1">
-                                  ? 'tile-selected'
+                            {visibleSubs.map((sub) => (
-                                  : 'bg-neutral-50 dark:bg-neutral-700 border-2 border-transparent hover:bg-neutral-100 dark:hover:bg-neutral-600'
+                              <div key={sub}>
-                              }`}
+                                <h5 className="mb-1.5 text-[10px] font-medium uppercase tracking-wider text-neutral-400 dark:text-neutral-500">
-                            >
+                                  {t(`email.subcategories.${sub}`, sub)}
-                              <div className="flex items-center justify-between gap-2">
+                                </h5>
-                                <p className="font-medium text-neutral-900 dark:text-neutral-100 truncate">
+                                <div className="space-y-2">
-                                  {templateInfo?.name || template.template_key}
+                                  {bySub[sub].map(renderTemplate)}
-                                </p>
-                                <div className="flex items-center gap-1.5 flex-shrink-0">
-                                  {featureOff && (
-                                    <span
-                                      className="text-[10px] uppercase tracking-wider px-1.5 py-0.5 rounded font-semibold bg-amber-100 text-amber-800 dark:bg-amber-900/40 dark:text-amber-200"
-                                      title={t('email.featureOffTooltip', 'The feature this template belongs to is currently disabled. You can still edit the template — it will be used once the feature is re-enabled.')}
-                                    >
-                                      {t('email.featureOff', 'Feature off')}
-                                    </span>
-                                  )}
-                                  <span className="text-xs px-2 py-0.5 rounded-full bg-neutral-200 dark:bg-neutral-600 text-neutral-600 dark:text-neutral-300">
-                                    {translationCount}/{SUPPORTED_LANGUAGES.length}
-                                  </span>
                                 </div>
                               </div>
-                              <p className="text-sm text-neutral-500 dark:text-neutral-400 mt-1 truncate">
+                            ))}
-                                {enTranslation?.subject || ''}
+                          </div>
-                              </p>
+                        </div>
-                            </button>
+                      );
-                          );
+                    }
-                        })}
+                    return (
+                      <div key={category}>
+                        <h4 className="px-1 mb-2 text-[11px] font-semibold uppercase tracking-wider text-neutral-500 dark:text-neutral-400">
+                          {t(`email.categories.${category}`, category)}
+                        </h4>
+                        <div className="space-y-2">
+                          {byCategory[category].map(renderTemplate)}
+                        </div>
                       </div>
-                    </div>
+                    );
-                  ))}
+                  })}
                 </div>
               );
             })()}