Fix order-filter dropdowns, restructure Konto identity line, drop blog reset link

- CustomSelect.tsx: mousedown on an option blurred the trigger button
  before the click landed, unmounting the list before anything could be
  selected — add preventDefault on the list's mousedown to stop that.
- KontoShell no longer renders "Eingeloggt als ..." above each page's
  content; each page renders its own title then AccountIdentity right
  below it, and ProfileForm's now-duplicate email/Kundennummer line is
  removed.
- Blog category filter: drop the separate "Zurücksetzen" link — clicking
  an active category badge again already deactivates it.
- Werkzeuge cards: more vertical gap between stacked cards below sm:.
- Legal pages' "Stand: ..." line is now derived from the LegalPages doc's
  own updatedAt instead of a hand-typed string.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018unaXmuzVA8ct1b6WoyP1U

app/lib/payload.ts

@@ -838,6 +838,7 @@ export type LegalPage = {
   title: string;
   content: unknown;
   attachment: { url: string; title: string } | null;
+  updatedAt: string;
 };
 
 type PayloadLegalPage = {
@@ -845,6 +846,7 @@ type PayloadLegalPage = {
   title: string;
   content: unknown;
   attachment: { url: string; title: string } | number | null;
+  updatedAt: string;
 };
 
 export async function getLegalPage(type: LegalPageType, options?: { draft?: boolean }): Promise<LegalPage | null> {
@@ -872,6 +874,7 @@ export async function getLegalPage(type: LegalPageType, options?: { draft?: bool
       typeof doc.attachment === "object" && doc.attachment
         ? { url: doc.attachment.url, title: doc.attachment.title }
         : null,
+    updatedAt: doc.updatedAt,
   };
 }