Improve script error dialogs #304

- Include the script's directory path #304.
- Exclude Windows-specific instructions on non-Windows OS.
- Standardize language across dialogs for consistency.

Other supporting changes:

- Add script diagnostics data collection from main process.
- Document script file storage and execution tamper protection in
  SECURITY.md.
- Remove redundant comment in `NodeReadbackFileWriter`.
- Centralize error display for uniformity and simplicity.
- Simpify `WindowVariablesValidator` to omit checks when not on the
  renderer process.
- Improve and centralize Electron environment detection.
- Use more emphatic language (don't worry) in error messages.

src/infrastructure/ReadbackFileWriter/NodeReadbackFileWriter.ts

@@ -27,11 +27,6 @@ export class NodeReadbackFileWriter implements ReadbackFileWriter {
     const fileWritePipelineActions: ReadonlyArray<() => Promise<FileWriteOutcome>> = [
       () => this.createOrOverwriteFile(filePath, fileContents),
       () => this.verifyFileExistsWithoutReading(filePath),
-      /*
-        Reading the file contents back, we can detect if the file has been altered or
-        removed post-creation. Removal of scripts when reading back is seen by some antivirus
-        software when it falsely identifies a script as harmful.
-      */
       () => this.verifyFileContentsByReading(filePath, fileContents),
     ];
     for (const action of fileWritePipelineActions) {