Import/Export UX improvements (#16619)

* webui : added download action (#13552)

* webui : import and export (for all conversations)

* webui : fixed download-format, import of one conversation

* webui : add ExportedConversations type for chat import/export

* feat: Update naming & order

* chore: Linting

* feat: Import/Export UX improvements

* chore: update webui build output

* feat: Update UI placement of Import/Export tab in Chat Settings Dialog

* refactor: Cleanup

chore: update webui build output

* feat: Enable shift-click multiple conversation items selection

* chore: update webui static build

* chore: update webui static build

---------

Co-authored-by: Sascha Rogmann <github@rogmann.org>

tools/server/webui/src/lib/utils/conversation-utils.ts

@@ -0,0 +1,30 @@
+/**
+ * Utility functions for conversation data manipulation
+ */
+
+/**
+ * Creates a map of conversation IDs to their message counts from exported conversation data
+ * @param exportedData - Array of exported conversations with their messages
+ * @returns Map of conversation ID to message count
+ */
+export function createMessageCountMap(
+	exportedData: Array<{ conv: DatabaseConversation; messages: DatabaseMessage[] }>
+): Map<string, number> {
+	const countMap = new Map<string, number>();
+
+	for (const item of exportedData) {
+		countMap.set(item.conv.id, item.messages.length);
+	}
+
+	return countMap;
+}
+
+/**
+ * Gets the message count for a specific conversation from the count map
+ * @param conversationId - The ID of the conversation
+ * @param countMap - Map of conversation IDs to message counts
+ * @returns The message count, or 0 if not found
+ */
+export function getMessageCount(conversationId: string, countMap: Map<string, number>): number {
+	return countMap.get(conversationId) ?? 0;
+}