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/components/Tools.tsx

@@ -35,7 +35,7 @@ export async function Tools() {
           arrives where the fluid floor also sits), stacked below sm;
           internal icon+text layout stays horizontal at every size, only
           the outer span changes */}
-      <RevealGroup className="grid grid-cols-1 sm:grid-cols-12 gap-10 sm:gap-[var(--layout-grid-gap)] px-[var(--layout-padding-x)] w-full">
+      <RevealGroup className="grid grid-cols-1 gap-y-14 sm:grid-cols-12 sm:gap-y-10 gap-x-10 sm:gap-x-[var(--layout-grid-gap)] px-[var(--layout-padding-x)] w-full">
         {tools.map((tool) => (
           <RevealItem
             key={tool.id}