feat(templates): add support for HTML templates

lib/__tests__/template-utils.test.ts

@@ -20,6 +20,7 @@ function makeTemplate(overrides: Partial<EmailTemplate> = {}): EmailTemplate {
     name: 'Test Template',
     subject: '',
     body: '',
+    isHTML: false,
     category: '',
     isFavorite: false,
     createdAt: '2026-01-01T00:00:00Z',

lib/template-types.ts

@@ -3,6 +3,7 @@ export interface EmailTemplate {
   name: string;
   subject: string;
   body: string;
+  isHTML?: boolean;
   category: string;
   defaultRecipients?: {
     to?: string[];

lib/template-utils.ts

@@ -173,7 +173,8 @@ export function importTemplates(json: string): ImportResult {
       id: generateUUID(),
       name: sanitizeText(t.name),
       subject: sanitizeText(t.subject),
-      body: sanitizeText(t.body),
+      body: t.isHTML ? String(t.body || '') : sanitizeText(t.body),
+      isHTML: Boolean(t.isHTML),
       category: sanitizeText(t.category),
       defaultRecipients: recipients && typeof recipients === 'object'
         ? {