fix(getChat): resolve LID for unknown contacts via WAWebContactSyncUtils (wwebjs#3834)

When sendMessage is called for a contact not yet synced, findOrCreateLatestChat
fails with "No LID for user". This adds a third fallback in getChat that uses
WAWebContactSyncUtils.constructUsyncDeltaQuery to resolve the phone number to
a LID via WhatsApp servers, then retries findOrCreateLatestChat with the
resolved LID.

The fix preserves the existing behavior:
- 1st: fast in-memory cache lookup via Store.Chat.get()
- 2nd: async findOrCreateLatestChat with the original WID
- 3rd (new): LID resolution + retry (only when both above fail)

Author: jeremyandes

src/util/Injected/Utils.js

@@ -581,7 +581,25 @@ exports.LoadUtils = () => {
                 chat = null;
             }
         } else {
-            chat = window.Store.Chat.get(chatWid) || (await window.Store.FindOrCreateChat.findOrCreateLatestChat(chatWid))?.chat;
+            chat = window.Store.Chat.get(chatWid);
+            if (!chat) {
+                chat = (await window.Store.FindOrCreateChat.findOrCreateLatestChat(chatWid).catch(() => null))?.chat;
+            }
+            if (!chat) {
+                try {
+                    const query = window.require('WAWebContactSyncUtils').constructUsyncDeltaQuery([{
+                        type: 'add',
+                        phoneNumber: chatWid.user
+                    }]);
+                    const result = await query.execute();
+                    if (result?.list?.[0]?.lid) {
+                        const chatLid = window.Store.WidFactory.createWid(result.list[0].lid);
+                        chat = (await window.Store.FindOrCreateChat.findOrCreateLatestChat(chatLid).catch(() => null))?.chat;
+                    }
+                } catch (e) {
+                    // LID resolution failed, chat remains undefined
+                }
+            }
         }
 
         return getAsModel && chat