Fix tool log streaming — switch from subprocess.run to Popen

subprocess.run with capture_output=True blocked until process exit,
dumping all output at once. Now uses Popen with line-by-line reading,
-u flag, and PYTHONUNBUFFERED=1 so logs stream in real time.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

gui/app.py

@@ -191,23 +191,29 @@ class ArmaModManagerApp(ctk.CTk):
 
     def run_tool(self, script_args: list[str]) -> None:
         """Run a maintenance script via subprocess, streaming output to Logs."""
+        import os
         script = script_args[0]
         extra  = script_args[1:]
 
         def worker() -> None:
             self.post_log(f"\n{'─'*50}\n  {' '.join(script_args)}\n{'─'*50}\n")
             try:
-                result = subprocess.run(
-                    [sys.executable, str(PROJECT_ROOT / script)] + extra,
-                    capture_output=True, text=True, cwd=str(PROJECT_ROOT),
+                env = os.environ.copy()
+                env["PYTHONUNBUFFERED"] = "1"
+                proc = subprocess.Popen(
+                    [sys.executable, "-u", str(PROJECT_ROOT / script)] + extra,
+                    stdout=subprocess.PIPE,
+                    stderr=subprocess.STDOUT,
+                    text=True,
+                    cwd=str(PROJECT_ROOT),
+                    env=env,
                 )
-                if result.stdout:
-                    self.post_log(result.stdout)
-                if result.stderr:
-                    self.post_log(result.stderr)
-                ok = result.returncode == 0
+                for line in iter(proc.stdout.readline, ""):
+                    self.post_log(line)
+                proc.wait()
+                ok = proc.returncode == 0
                 self.post_log(
-                    f"\n{'✓  Done' if ok else f'✗  Exited with code {result.returncode}'}.\n"
+                    f"\n{'✓  Done' if ok else f'✗  Exited with code {proc.returncode}'}.\n"
                 )
             except Exception as e:
                 self.post_log(f"\n✗  Failed to start {script}: {e}\n")