fixed injection watcher

frontend/src/api/client.ts

@@ -228,22 +228,17 @@ export const api = {
     });
 
     if (!response.ok || !response.body) {
-      throw new Error("Failed to send message");
+      const detail = await response.text().catch(() => "");
+      throw new Error(detail || `Ошибка отправки (${response.status})`);
     }
 
     const reader = response.body.getReader();
     const decoder = new TextDecoder();
     let buffer = "";
 
-    while (true) {
-      const { done, value } = await reader.read();
-      if (done) break;
-
-      buffer += decoder.decode(value, { stream: true });
-      const parts = buffer.split("\n\n");
-      buffer = parts.pop() ?? "";
-
+    const flushParts = function* (parts: string[]) {
       for (const part of parts) {
+        if (!part.trim()) continue;
         const lines = part.split("\n");
         let event = "message";
         let data = "";
@@ -257,6 +252,24 @@ export const api = {
           yield { event, data: JSON.parse(data) };
         }
       }
+    };
+
+    while (true) {
+      const { done, value } = await reader.read();
+      if (value) {
+        buffer += decoder.decode(value, { stream: !done });
+      }
+
+      const parts = buffer.split("\n\n");
+      buffer = parts.pop() ?? "";
+      yield* flushParts(parts);
+
+      if (done) {
+        if (buffer.trim()) {
+          yield* flushParts([buffer]);
+        }
+        break;
+      }
     }
   },