Fix garbled ticket text from HTML emails (Outlook VML/entities)

extractBody() used a naive tag-stripping regex as a fallback, which
strips <style> tags but leaves their CSS content behind as visible
text, and never decodes HTML entities. Outlook's VML style block
(v\:* {behavior:url(#default#VML);} ...) and &nbsp;/&laquo; entities
were leaking straight into ticket bodies as a result.

Now uses html-to-text (already a transitive dep via mailparser,
promoted to direct) to convert the HTML part whenever present, which
correctly drops <head>/<style> content and decodes entities. Also
stopped trusting parsed.text unconditionally — some senders' plain-text
alternative isn't actually clean, so HTML is now the primary source
whenever available.

src/lib/mail/imap.ts

@@ -1,5 +1,6 @@
 import { ImapFlow } from "imapflow";
 import { simpleParser, type ParsedMail } from "mailparser";
+import { htmlToText } from "html-to-text";
 import { getMailboxSettings, saveMailboxSettings, disableMailboxConfig, type MailboxSettings } from "@/lib/mail/config";
 import { recordEmailInboundMessage } from "@/lib/tickets/service";
 import { saveAttachment } from "@/lib/attachments/storage";
@@ -28,11 +29,16 @@ function createClient(settings: MailboxSettings): ImapFlow {
   });
 }
 
+// Prefer converting the HTML part ourselves rather than trusting parsed.text
+// blindly — some senders (Outlook in particular) produce a text/plain
+// alternative that isn't actually clean, while html-to-text reliably drops
+// <head>/<style> content (e.g. Outlook's VML behavior: url(...) rules) and
+// decodes entities, which a naive tag-stripping regex cannot do.
 function extractBody(parsed: ParsedMail): string {
-  if (parsed.text) return parsed.text;
   if (typeof parsed.html === "string") {
-    return parsed.html.replace(/<[^>]+>/g, " ").replace(/\s+/g, " ").trim();
+    return htmlToText(parsed.html, { baseElements: { selectors: ["body"] }, wordwrap: false }).trim();
   }
+  if (parsed.text) return parsed.text;
   return "(пустое письмо)";
 }
 

src/types/html-to-text.d.ts

@@ -0,0 +1,10 @@
+declare module "html-to-text" {
+  interface HtmlToTextOptions {
+    wordwrap?: number | false;
+    baseElements?: { selectors?: string[] };
+    [key: string]: unknown;
+  }
+
+  export function htmlToText(html: string, options?: HtmlToTextOptions): string;
+  export function convert(html: string, options?: HtmlToTextOptions): string;
+}