Fix code highlighting and optimize category select

This commit introduces a batched debounce mechanism for managing user
selection state changes. It effectively reduces unnecessary processing
during rapid script checking, preventing multiple triggers for code
compilation and UI rendering.

Key improvements include:

- Enhanced performance, especially noticeable when selecting large
  categories. This update resolves minor UI freezes experienced when
  selecting categories with numerous scripts.
- Correction of a bug where the code area only highlighted the last
  selected script when multiple scripts were chosen.

Other changes include:

- Timing functions:
  - Create a `Timing` folder for `throttle` and the new
    `batchedDebounce` functions.
  - Move these functions to the application layer from the presentation
    layer, reflecting their application-wide use.
  - Refactor existing code for improved clarity, naming consistency, and
    adherence to new naming conventions.
  - Add missing unit tests.
- `UserSelection`:
  - State modifications in `UserSelection` now utilize a singular object
    inspired by the CQRS pattern, enabling batch updates and flexible
    change configurations, thereby simplifying change management.
- Remove the `I` prefix from related interfaces to align with new coding
  standards.
- Refactor related code for better testability in isolation with
  dependency injection.
- Repository:
  - Move repository abstractions to the application layer.
  - Improve repository abstraction to combine `ReadonlyRepository` and
    `MutableRepository` interfaces.
- E2E testing:
  - Introduce E2E tests to validate the correct batch selection
    behavior.
  - Add a specialized data attribute in `TheCodeArea.vue` for improved
    testability.
  - Reorganize shared Cypress functions for a more idiomatic Cypress
    approach.
  - Improve test documentation with related information.
- `SelectedScript`:
  - Create an abstraction for simplified testability.
  - Introduce `SelectedScriptStub` in tests as a substitute for the
    actual object.

tests/unit/application/Context/State/Selection/Script/UserSelectedScript.spec.ts

@@ -0,0 +1,27 @@
+import { describe, it, expect } from 'vitest';
+import { ScriptStub } from '@tests/unit/shared/Stubs/ScriptStub';
+import { UserSelectedScript } from '@/application/Context/State/Selection/Script/UserSelectedScript';
+
+describe('UserSelectedScript', () => {
+  it('id is same as script id', () => {
+    // arrange
+    const expectedId = 'scriptId';
+    const script = new ScriptStub(expectedId);
+    const sut = new UserSelectedScript(script, false);
+    // act
+    const actualId = sut.id;
+    // assert
+    expect(actualId).to.equal(expectedId);
+  });
+  it('throws when revert is true for irreversible script', () => {
+    // arrange
+    const scriptId = 'irreversibleScriptId';
+    const expectedError = `The script with ID '${scriptId}' is not reversible and cannot be reverted.`;
+    const script = new ScriptStub(scriptId)
+      .withRevertCode(undefined);
+    // act
+    const act = () => new UserSelectedScript(script, true);
+    // assert
+    expect(act).to.throw(expectedError);
+  });
+});