Produce a more helpful error if creating output file fails

ocrs-cli/src/main.rs

@@ -279,7 +279,8 @@ fn main() -> Result<(), Box<dyn Error>> {
 
     let write_output_str = |content: String| -> Result<(), Box<dyn Error>> {
         if let Some(output_path) = &args.output_path {
-            std::fs::write(output_path, content.into_bytes())?;
+            std::fs::write(output_path, content.into_bytes())
+                .file_error_context("Failed to write output file", output_path)?;
         } else {
             println!("{}", content);
         }
@@ -309,7 +310,8 @@ fn main() -> Result<(), Box<dyn Error>> {
             let Some(output_path) = args.output_path else {
                 return Err("Output path must be specified when generating annotated PNG".into());
             };
-            write_image(&output_path, annotated_img.view())?;
+            write_image(&output_path, annotated_img.view())
+                .file_error_context("Failed to write output file", &output_path)?;
         }
     }