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.

src/application/Context/State/Code/ApplicationCode.ts

@@ -1,7 +1,7 @@
-import { SelectedScript } from '@/application/Context/State/Selection/SelectedScript';
-import { IReadOnlyUserSelection } from '@/application/Context/State/Selection/IUserSelection';
 import { EventSource } from '@/infrastructure/Events/EventSource';
 import { IScriptingDefinition } from '@/domain/IScriptingDefinition';
+import { SelectedScript } from '@/application/Context/State/Selection/Script/SelectedScript';
+import { ReadonlyScriptSelection } from '@/application/Context/State/Selection/Script/ScriptSelection';
 import { CodeChangedEvent } from './Event/CodeChangedEvent';
 import { CodePosition } from './Position/CodePosition';
 import { ICodeChangedEvent } from './Event/ICodeChangedEvent';
@@ -17,12 +17,12 @@ export class ApplicationCode implements IApplicationCode {
   private scriptPositions = new Map<SelectedScript, CodePosition>();
 
   constructor(
-    userSelection: IReadOnlyUserSelection,
+    selection: ReadonlyScriptSelection,
     private readonly scriptingDefinition: IScriptingDefinition,
     private readonly generator: IUserScriptGenerator = new UserScriptGenerator(),
   ) {
-    this.setCode(userSelection.selectedScripts);
-    userSelection.changed.on((scripts) => {
+    this.setCode(selection.selectedScripts);
+    selection.changed.on((scripts) => {
       this.setCode(scripts);
     });
   }