Clarify literal type preservation in PageObjectModel documentation

[Copilot]

The existing documentation stated "Use satisfies to preserve types!" without explaining what literal types are or why this matters for PageObjectModel usage.

Changes

• Expanded JSDoc @remarks section in types/page-object.d.ts for PageObjectModel interface
  • Defined literal types with concrete examples ("#searchBar" vs string)
  • Explained type widening behavior when using : PageObjectModel annotation
  • Documented three benefits of satisfies: validation, literal type preservation, better inference
  • Added side-by-side comparison showing type differences

Example

// ❌ BAD: Type annotation widens to index signature
const page1: PageObjectModel = {
  elements: { searchBar: "#search" }  // Type: { [key: string]: string | ElementProperties }
};

// ✅ GOOD: satisfies preserves exact structure
const page2 = {
  elements: { searchBar: "#search" }  // Type: { searchBar: "#search" }
} satisfies PageObjectModel;

This enables TypeScript to know exact element keys like searchBar instead of treating elements as an arbitrary string-keyed record, improving autocomplete and type safety when using EnhancedPageObject.

Original prompt

In the above page object definition, notice that we've defined it as const myPage = {} satisfies PageObjectModel instead of const myPage: PageObjectModel = {}. Doing so helps preserve the literal type of the page object and all its components when they are passed to ElementPageObject, instead of downleveling them to take the loose types defined in PageObjectModel.

what do you mean by literal type fo the page object and all it's componentn

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