refactor: improve AI event handling and conflict display in chat

- AI fetches events on-demand via callbacks for better efficiency
- Add conflict detection with warning display when proposing overlapping events
- Improve event search and display in chat interface
- Load full chat history for display while limiting AI context

apps/client/src/app/editEvent.tsx

@@ -22,9 +22,6 @@ import { EventService, ChatService } from "../services";
 import { buildRRule, CreateEventDTO } from "@calchat/shared";
 import { useChatStore } from "../stores";
 
-// Direct store access for getting current state in callbacks
-const getChatStoreState = () => useChatStore.getState();
-
 type EditEventTextFieldProps = {
   titel: string;
   text?: string;
@@ -443,31 +440,25 @@ const EditEventScreen = () => {
         : undefined,
     };
 
-    // Chat mode: update proposal locally and on server
+    // Chat mode: update proposal on server and sync response to local store
     if (mode === "chat" && proposalContext) {
       try {
         const context = JSON.parse(proposalContext) as ProposalContext;
 
-        // Update locally in ChatStore
-        const currentMessages = getChatStoreState().messages;
-        const message = currentMessages.find((m) => m.id === context.messageId);
-
-        if (message?.proposedChanges) {
-          const updatedProposals = message.proposedChanges.map((p) =>
-            p.id === context.proposalId ? { ...p, event: eventObject } : p,
-          );
-          updateMessage(context.messageId, {
-            proposedChanges: updatedProposals,
-          });
-        }
-
-        // Persist to server
-        await ChatService.updateProposalEvent(
+        // Persist to server - returns updated message with recalculated conflictingEvents
+        const updatedMessage = await ChatService.updateProposalEvent(
           context.messageId,
           context.proposalId,
           eventObject,
         );
 
+        // Update local ChatStore with server response (includes updated conflicts)
+        if (updatedMessage?.proposedChanges) {
+          updateMessage(context.messageId, {
+            proposedChanges: updatedMessage.proposedChanges,
+          });
+        }
+
         router.back();
       } catch (error) {
         console.error("Failed to update proposal:", error);