feat: support multiple event proposals in single AI response

- Change proposedChange to proposedChanges array in ChatMessage type
- Add unique id and individual respondedAction to each ProposedEventChange
- Implement arrow navigation UI for multiple proposals with "Event X von Y" counter
- Add updateProposalResponse() method for per-proposal confirm/reject tracking
- GPTAdapter now collects multiple tool call results into proposals array
- Add RRULE documentation to system prompt (separate events for different times)
- Fix RRULE parsing to strip RRULE: prefix if present
- Add log summarization for large args (conversationHistory, existingEvents)
- Keep proposedChanges logged in full for debugging AI issues

apps/client/src/components/ProposedEventCard.tsx

@@ -5,7 +5,6 @@ import { EventCardBase } from "./EventCardBase";
 
 type ProposedEventCardProps = {
   proposedChange: ProposedEventChange;
-  respondedAction?: "confirm" | "reject";
   onConfirm: () => void;
   onReject: () => void;
 };
@@ -59,12 +58,12 @@ const ConfirmRejectButtons = ({
 
 export const ProposedEventCard = ({
   proposedChange,
-  respondedAction,
   onConfirm,
   onReject,
 }: ProposedEventCardProps) => {
   const event = proposedChange.event;
-  const isDisabled = !!respondedAction;
+  // respondedAction is now part of the proposedChange
+  const isDisabled = !!proposedChange.respondedAction;
 
   if (!event) {
     return null;
@@ -82,7 +81,7 @@ export const ProposedEventCard = ({
       >
         <ConfirmRejectButtons
           isDisabled={isDisabled}
-          respondedAction={respondedAction}
+          respondedAction={proposedChange.respondedAction}
           onConfirm={onConfirm}
           onReject={onReject}
         />