fix: socket reconnect recovery never runs for chats started from the home page (open-webui#26913)

When a chat is started from the home page, the URL is switched to /c/{id} with
history.replaceState, so the Chat component is never remounted and chatIdProp
stays empty for the lifetime of that view. Both websocket recovery paths,
handleSocketConnect and the chat:active fallback, are gated on chatIdProp and
therefore never run for these chats. After any websocket drop during a response
(mobile backgrounding, VPN or IP change, wake from sleep) the completed response
is never fetched and the chat stays stuck in a loading state until a manual page
refresh. Chats opened directly via /c/{id} recover fine, which is why the bug
only reproduces reliably on freshly started chats.

Gate both recovery paths on the chatId store instead, which is set for every
persisted chat, and let loadChat fall back to it so the recovery reload also
works when chatIdProp is empty. Chats opened via /c/{id} behave exactly as
before and temporary chats stay excluded.

The same gate likely explains the remaining reports in open-webui#26315.

Fixes open-webui#26844

Author: Classic298

src/lib/components/chat/Chat.svelte

@@ -634,7 +634,7 @@
 				} else if (type === 'chat:active') {
 					if (!data?.active) {
 						taskIds = null;
-						if (chatIdProp && !$temporaryChatEnabled && hasPendingAssistantLeaf()) {
+						if ($chatId && !$temporaryChatEnabled && hasPendingAssistantLeaf()) {
 							await loadChat();
 						}
 					}
@@ -907,7 +907,8 @@
 		);
 
 	const handleSocketConnect = async () => {
-		if (!chatIdProp || $temporaryChatEnabled) {
+		// Gate on $chatId, not chatIdProp: chats started from the home page keep an empty chatIdProp
+		if (!$chatId || $temporaryChatEnabled) {
 			return;
 		}
 
@@ -1590,7 +1591,8 @@
 	};
 
 	const loadChat = async () => {
-		chatId.set(chatIdProp);
+		// chatIdProp is empty for chats started from the home page (URL set via replaceState)
+		chatId.set(chatIdProp || $chatId);
 
 		if ($temporaryChatEnabled) {
 			temporaryChatEnabled.set(false);