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.

tests/unit/shared/Stubs/ElectronEnvironmentDetectorStub.ts

@@ -0,0 +1,26 @@
+import { ElectronEnvironmentDetector, ElectronProcessType } from '@/infrastructure/RuntimeEnvironment/Electron/ElectronEnvironmentDetector';
+
+export class ElectronEnvironmentDetectorStub implements ElectronEnvironmentDetector {
+  private isInsideElectron = true;
+
+  public process: ElectronProcessType = 'renderer';
+
+  public isRunningInsideElectron(): boolean {
+    return this.isInsideElectron;
+  }
+
+  public determineElectronProcessType(): ElectronProcessType {
+    return this.process;
+  }
+
+  public withNonElectronEnvironment(): this {
+    this.isInsideElectron = false;
+    return this;
+  }
+
+  public withElectronEnvironment(process: ElectronProcessType): this {
+    this.isInsideElectron = true;
+    this.process = process;
+    return this;
+  }
+}