Skip broken directory entries during discovery

src/tgvideo_check/discovery.py

@@ -33,10 +33,28 @@ def _discover_root(
     extensions: set[str],
     discovered: list[FileCandidate],
 ) -> None:
-    entries = sorted(root.iterdir(), key=lambda item: (not item.is_file(), item.name.lower()))
+    entries: list[tuple[Path, bool]] = []
+    try:
+        for entry in root.iterdir():
+            try:
+                entries.append((entry, entry.is_file()))
+            except OSError:
+                continue
+    except OSError:
+        return
+
+    entries.sort(key=lambda item: (not item[1], item[0].name.lower()))
+
+    for entry, is_file in entries:
+        if not is_file:
+            try:
+                is_dir = entry.is_dir()
+            except OSError:
+                continue
+
+            if not is_dir:
+                continue
 
-    for entry in entries:
-        if entry.is_dir():
             if recursive:
                 _discover_root(
                     root=entry,
@@ -50,7 +68,11 @@ def _discover_root(
         if extension not in extensions:
             continue
 
-        stat = entry.stat()
+        try:
+            stat = entry.stat()
+        except OSError:
+            continue
+
         discovered.append(
             FileCandidate(
                 path=entry,