Issue/13520 pos apply colors to home screen

[malinajirka]

Closes: #13520

Do Not Merge - #13482 needs to be merged first.

NOTE - This PR updates only background colors and product placeholder. It doesn't update buttons, texts, spacing or Floating action button as those will be done in a separate PR.

Description

This PR introduces these changes:

1. It updates surfaceDim and surfaceBright color definitions to match the DS (they were swapped between dark and light mode).
2. It updates the Home/Product Screen colors to match the DS.
3. It also updates the placeholder image for product items to match the the designs. (I've updated color of drawables to white to ensure they can be tinted without side-effects)
4. It updates the shimmer effect animation color and the list item skeleton view.

Testing information

Enter the POS and observe the updated designs of the home screen.
Open the ProductInfo dialog by clicking on the info icon and notice update colors of the dialog.

The tests that have been performed

I've followed the above testing information.

Images/gif

Designs	Implementation

[Shimmer Effect Animation](
https://github.com/user-attachments/assets/e5f44cd8-c334-4450-8e43-1e4a844e166f

)

• I have considered if this change warrants release notes and have added them to RELEASE-NOTES.txt if necessary. Use the "[Internal]" label for non-user-facing changes.

Reviewer (or Author, in the case of optional code reviews):

Please make sure these conditions are met before approving the PR, or request changes if the PR needs improvement:

• The PR is small and has a clear, single focus, or a valid explanation is provided in the description. If needed, please request to split it into smaller PRs.
• Ensure Adequate Unit Test Coverage: The changes are reasonably covered by unit tests or an explanation is provided in the PR description.
• Manual Testing: The author listed all the tests they ran, including smoke tests when needed (e.g., for refactorings). The reviewer confirmed that the PR works as expected on big (tablet) and small (phone) in case of UI changes, and no regressions are added.

[dangermattic]

	1 Error
🚫	This PR is tagged with status: do not merge label(s).

Generated by 🚫 Danger

[wpmobilebot]

📲 You can test the changes from this Pull Request in WooCommerce-Wear Android by scanning the QR code below to install the corresponding build.

	App Name	WooCommerce-Wear Android
	Platform	⌚️ Wear OS
	Flavor	Jalapeno
	Build Type	Debug
	Commit	ceb1309
	Direct Download	woocommerce-wear-prototype-build-pr13522-ceb1309.apk

[wpmobilebot]

📲 You can test the changes from this Pull Request in WooCommerce Android by scanning the QR code below to install the corresponding build.

	App Name	WooCommerce Android
	Platform	📱 Mobile
	Flavor	Jalapeno
	Build Type	Debug
	Commit	ceb1309
	Direct Download	woocommerce-prototype-build-pr13522-ceb1309.apk