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/presentation/bootstrapping/DependencyProvider.spec.ts

@@ -20,6 +20,7 @@ describe('DependencyProvider', () => {
       useLogger: createTransientTests(),
       useCodeRunner: createTransientTests(),
       useDialog: createTransientTests(),
+      useScriptDiagnosticsCollector: createTransientTests(),
     };
     Object.entries(testCases).forEach(([key, runTests]) => {
       const registeredKey = InjectionKeys[key].key;