feat(system): close the browser server's log files before its root goes

The logs now live in the library's data folder, which for the browser test
server is <root>/user/__promptmanager; Windows could not remove the temp
root while the server still held prompt_manager.log open. The API test's
node folder is spelled in lower case because public paths are case-folded
on Windows.

tests/browser/server.py

@@ -3,6 +3,7 @@
 import argparse
 import asyncio
 import json
+import logging
 import os
 import shutil
 import socket
@@ -654,6 +655,18 @@ def exit_when_stdin_closes(loop: asyncio.AbstractEventLoop) -> threading.Thread:
     return thread
 
 
+def close_owned_log_files() -> None:
+    """Close Prompt Manager's own log handlers before the temp root goes.
+
+    The logs live in the library's data folder (#249 S6b), which for this
+    server is <root>/user/__promptmanager; Windows cannot remove a file
+    this process still has open.
+    """
+    for handler in logging.getLogger("prompt_manager").handlers[:]:
+        if getattr(handler, "_prompt_manager_owned", False) is True:
+            handler.close()
+
+
 def main(argv: list[str] | None = None) -> None:
     parser = argparse.ArgumentParser()
     parser.add_argument(
@@ -678,6 +691,7 @@ def main(argv: list[str] | None = None) -> None:
         finally:
             # create_app works inside the root; Windows cannot remove a process's cwd.
             os.chdir(original_cwd)
+            close_owned_log_files()
 
 
 if __name__ == "__main__":

tests/test_api_library_location.py

@@ -36,7 +36,8 @@ URL = "/prompt_manager/system/library"
 class LibraryAPITestCase(AdminAPITestCase):
     async def get_application(self):
         app = await super().get_application()
-        self.ext = os.path.join(str(self.comfy_dir), "custom_nodes", "PM")
+        # Lower case: a public path is case-folded on Windows (normcase).
+        self.ext = os.path.join(str(self.comfy_dir), "custom_nodes", "pm")
         os.makedirs(self.ext)
         self.user = os.path.join(str(self.comfy_dir), "user")
         os.makedirs(self.user)
@@ -80,7 +81,7 @@ class TestLocationRoute(LibraryAPITestCase):
         self.assertEqual(
             body["location"],
             {
-                "path": "custom_nodes/PM/prompts.db",
+                "path": "custom_nodes/pm/prompts.db",
                 "source": "node_folder",
                 "movable": True,
                 "keep": False,