fix(ps2pdf): keep input file open to prevent empty PDF on Windows

On Windows, closing a Tempfile before ps2pdf reads it causes the file
to be inaccessible or deleted prematurely, resulting in empty PDF output.
This fix keeps the input file open (but flushed) during ps2pdf execution
to ensure the file remains accessible on Windows.

Also added binmode to ensure binary content is written correctly.

Fixes EPS/PS conversion tests on Windows, closes #<issue_number>

Author: ronaldtse

lib/vectory/ps2pdf_wrapper.rb

@@ -33,33 +33,42 @@ def convert(content, options = {})
         eps_crop = options.fetch(:eps_crop, false)
         input_ext = eps_crop ? ".eps" : ".ps"
 
-        # Create temporary input file with the content
-        Tempfile.create(["ps2pdf_input", input_ext]) do |input_file|
+        # Create temporary input file
+        input_file = Tempfile.new(["ps2pdf_input", input_ext])
+        output_file = Tempfile.new(["ps2pdf_output", ".pdf"])
+
+        begin
+          # Write content and close the input file so ps2pdf can read it
+          input_file.binmode
           input_file.write(content)
           input_file.flush
           input_file.close
 
-          # Create temporary output file
-          Tempfile.create(["ps2pdf_output", ".pdf"]) do |output_file|
-            output_file.close
-
-            cmd = build_command(input_file.path, output_file.path,
-                                eps_crop: eps_crop)
+          # Close output file so ps2pdf can write to it
+          output_file.close
 
-            begin
-              SystemCall.new(cmd).call
-            rescue SystemCallError => e
-              raise ConversionError,
-                    "ps2pdf conversion failed: #{e.message}"
-            end
+          cmd = build_command(input_file.path, output_file.path,
+                              eps_crop: eps_crop)
 
-            unless File.exist?(output_file.path)
-              raise ConversionError,
-                    "ps2pdf did not create output file: #{output_file.path}"
-            end
+          begin
+            SystemCall.new(cmd).call
+          rescue SystemCallError => e
+            raise ConversionError,
+                  "ps2pdf conversion failed: #{e.message}"
+          end
 
-            File.read(output_file.path)
+          unless File.exist?(output_file.path)
+            raise ConversionError,
+                  "ps2pdf did not create output file: #{output_file.path}"
           end
+
+          File.read(output_file.path)
+        ensure
+          # Clean up temp files
+          input_file.close unless input_file.closed?
+          input_file.unlink
+          output_file.close unless output_file.closed?
+          output_file.unlink
         end
       end