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/CustomSelect.tsx

@@ -131,6 +131,11 @@ export function CustomSelect({
           ref={listRef}
           role="listbox"
           aria-label={label}
+          // Without this, a mousedown on an <li> blurs the trigger button
+          // first (li isn't focusable) — the resulting onBlur closes and
+          // unmounts this list before the click event ever fires, so
+          // nothing is ever selectable by mouse/touch.
+          onMouseDown={(e) => e.preventDefault()}
           className="absolute z-20 mt-1 w-full sm:min-w-[12rem] max-h-64 overflow-y-auto bg-bg-base border border-border rounded-sm shadow-lg py-1"
         >
           {allOptions.map((o, i) => (