fix: prevent stdout data loss in CommandRunner

readyReadStandardOutput was consuming the buffer before Result
was constructed, causing result.stdout to always be empty.
Now accumulates data in a QByteArray buffer for both signal
emission and final result.

Author: Sopwit

src/backend/system/commandrunner.cpp

@@ -9,9 +9,14 @@ CommandRunner::Result CommandRunner::run(const QString &program, const QStringLi
 {
     QProcess process;
 
+    // Tüm stdout verisini biriktir — hem anlık sinyal hem de sonuç için
+    QByteArray stdoutBuf;
+
     // Stdout'u anlık olarak sinyal olarak ilet
     connect(&process, &QProcess::readyReadStandardOutput, this, [&]() {
-        const QString line = QString::fromUtf8(process.readAllStandardOutput()).trimmed();
+        const QByteArray data = process.readAllStandardOutput();
+        stdoutBuf.append(data);
+        const QString line = QString::fromUtf8(data).trimmed();
         if (!line.isEmpty())
             emit outputLine(line);
     });
@@ -28,9 +33,13 @@ CommandRunner::Result CommandRunner::run(const QString &program, const QStringLi
 
     process.waitForFinished(-1);
 
+    // waitForFinished sonrası kalan veriyi de oku
+    const QByteArray remaining = process.readAllStandardOutput();
+    stdoutBuf.append(remaining);
+
     return Result {
         .exitCode = process.exitCode(),
-        .stdout   = QString::fromUtf8(process.readAllStandardOutput()),
+        .stdout   = QString::fromUtf8(stdoutBuf),
         .stderr   = QString::fromUtf8(process.readAllStandardError()),
     };
 }