Fix JSX attribute syntax in constraint editor descriptions

German curly quotes („…") combined with a closing straight " inside
JSX attribute values were terminating the attribute prematurely, e.g.
`description="Beispiel: „X" (jugendgerecht)."` lost everything after
the inner straight quote. Switch all such descriptions to the JSX
expression form `description={"…"}` so the inner quotes are part of
a JavaScript string literal and parsed correctly.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

studio-v2/app/stundenplan/_components/regeln/SubjectMaxConsecutiveEditor.tsx

@@ -27,7 +27,7 @@ export function SubjectMaxConsecutiveEditor() {
     <ConstraintShell
       testId="subject-max-consecutive-editor"
       title="Fach: Max. Stunden am Stueck"
-      description="Beispiel: „Mathe nicht mehr als 2 Stunden am Stueck" (keine Dreifach-Stunde)."
+      description={"Beispiel: „Mathe nicht mehr als 2 Stunden am Stueck" (keine Dreifach-Stunde)."}
       newLabel="+ Neue Regel"
       newDisabled={subjects.length === 0}
       prereqWarning={subjects.length === 0 ? 'Zuerst Faecher anlegen.' : null}