fix: handle UpdateMessageSendSucceeded to prevent edit errors

Fixes "Message not found" error when editing immediately after sending.

**Problem**:
When sending a message, TDLib may return a temporary ID, then send
UpdateMessageSendSucceeded with the real server ID. We weren't handling
this update, so the cache kept the old ID while the server had a different
one, causing "Message not found" errors during edits.

**Solution**:
1. Added UpdateMessageSendSucceeded handler (client.rs:801-830)
   - Finds message with temporary ID
   - Replaces it with new message containing real server ID
   - Preserves reply_info if present

2. Added validation before editing (main_input.rs:574-589)
   - Checks message exists in cache
   - Better error messages with chat_id and message_id

3. Added positive ID check in start_editing_selected (mod.rs:240)
   - Blocks editing messages with temporary IDs (negative)

**Test**:
- Added test_edit_immediately_after_send (edit_message.rs:156-181)
- Verifies editing works right after send_message
- All 22 edit_message tests pass

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

src/app/mod.rs

@@ -234,7 +234,11 @@ impl App {
 
         // Сначала извлекаем данные из сообщения
         let msg_data = self.get_selected_message().and_then(|msg| {
-            if msg.can_be_edited() && msg.is_outgoing() {
+            // Проверяем:
+            // 1. Можно редактировать
+            // 2. Это исходящее сообщение
+            // 3. ID не временный (временные ID в TDLib отрицательные)
+            if msg.can_be_edited() && msg.is_outgoing() && msg.id().as_i64() > 0 {
                 Some((msg.id(), msg.text().to_string(), selected_idx.unwrap()))
             } else {
                 None