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/server/src/repositories/mongo/models/ChatModel.ts

@@ -44,6 +44,7 @@ const UpdatesSchema = new Schema<UpdateEventDTO>(
 
 const ProposedChangeSchema = new Schema<ProposedEventChange>(
   {
+    id: { type: String, required: true },
     action: {
       type: String,
       enum: ["create", "update", "delete"],
@@ -52,6 +53,10 @@ const ProposedChangeSchema = new Schema<ProposedEventChange>(
     eventId: { type: String },
     event: { type: EventSchema },
     updates: { type: UpdatesSchema },
+    respondedAction: {
+      type: String,
+      enum: ["confirm", "reject"],
+    },
   },
   { _id: false },
 );
@@ -77,12 +82,9 @@ const ChatMessageSchema = new Schema<
       type: String,
       required: true,
     },
-    proposedChange: {
-      type: ProposedChangeSchema,
-    },
-    respondedAction: {
-      type: String,
-      enum: ["confirm", "reject"],
+    proposedChanges: {
+      type: [ProposedChangeSchema],
+      default: undefined,
     },
   },
   {