chore: address cian's file permission comments

Author: 35C4n0r

lib/screentracker/pty_conversation.go

@@ -573,13 +573,13 @@ func (c *PTYConversation) SaveState() error {
 
 	// Create directory if it doesn't exist
 	dir := filepath.Dir(stateFile)
-	if err := os.MkdirAll(dir, 0o755); err != nil {
+	if err := os.MkdirAll(dir, 0o700); err != nil {
 		return xerrors.Errorf("failed to create state directory: %w", err)
 	}
 
 	// Write to temp file
 	tempFile := stateFile + ".tmp"
-	if err := os.WriteFile(tempFile, data, 0o644); err != nil {
+	if err := os.WriteFile(tempFile, data, 0o600); err != nil {
 		return xerrors.Errorf("failed to write temp state file: %w", err)
 	}