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/ScriptDiagnostics/ScriptEnvironmentDiagnosticsCollector.ts

@@ -0,0 +1,20 @@
+import { ScriptDiagnosticData, ScriptDiagnosticsCollector } from '@/application/ScriptDiagnostics/ScriptDiagnosticsCollector';
+import { RuntimeEnvironment } from '@/infrastructure/RuntimeEnvironment/RuntimeEnvironment';
+import { CurrentEnvironment } from '@/infrastructure/RuntimeEnvironment/RuntimeEnvironmentFactory';
+import { PersistentDirectoryProvider } from '@/infrastructure/CodeRunner/Creation/Directory/PersistentDirectoryProvider';
+import { ScriptDirectoryProvider } from '../CodeRunner/Creation/Directory/ScriptDirectoryProvider';
+
+export class ScriptEnvironmentDiagnosticsCollector implements ScriptDiagnosticsCollector {
+  constructor(
+    private readonly directoryProvider: ScriptDirectoryProvider = new PersistentDirectoryProvider(),
+    private readonly environment: RuntimeEnvironment = CurrentEnvironment,
+  ) { }
+
+  public async collectDiagnosticInformation(): Promise<ScriptDiagnosticData> {
+    const { directoryAbsolutePath } = await this.directoryProvider.provideScriptDirectory();
+    return {
+      scriptsDirectoryAbsolutePath: directoryAbsolutePath,
+      currentOperatingSystem: this.environment.os,
+    };
+  }
+}