[Woo POS] Modularization: move shared image assets to WooFoundation

[jaclync]

Part of WOOMOB-935

Just one review is required.

Description

This PR moves shared image assets used by both the main app and POS to the WooFoundation module, consolidating them in preparation for POS modularization (#16176).

Key Changes:

• Created SharedImageAsset enum in WooFoundation with standardized SwiftUI Image and UIImage access
• Moved 5 shared image assets from main app to WooFoundation:
  • card-reader-update-progress-arrow and card-reader-update-progress-checkmark (used in reader update progress)
  • coupons (used in empty states)
  • location (used in reader connection alerts)
  • shopping-bags (used in cart empty state)
• Updated main app to use SharedImageAsset instead of direct image names
• Replaced POS-specific UIImage+POS.swift extension with SharedImageAsset usage
• Updated POS views to use SharedImageAsset for consistent image access

Benefits:

• Eliminates image duplication between app and POS module
• Provides type-safe image access through enum cases
• Centralizes shared resources in WooFoundation for easier maintenance
• Reduces coupling between POS and main app resources

Steps to reproduce

A quick regression test in POS would be helpful:

1. Build and run the app on an iPad
2. Navigate to POS
3. Verify the following images display correctly:
   • Empty cart shows shopping bags icon
   • Empty coupons list shows coupons icon
   • Card reader connection location alerts show location icon
   • Card reader update progress shows arrow/checkmark icons

Testing information

I tested the following scenarios on iPad A16 iOS 26.0 simulator, and SwiftUI previews in Xcode 26.

column 1	column 2

Card reader software update:

Simulator.Screen.Recording.-.iPad.A16.-.2025-10-02.at.10.56.29.mov

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• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.

[dangermattic]

	1 Warning
⚠️	This PR is assigned to the milestone 23.4. This milestone is due in less than 2 days. Please make sure to get it merged by then or assign it to a milestone with a later deadline.

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[wpmobilebot]

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

	App Name	WooCommerce iOS Prototype
	Build Number	pr16194-90ac9dc
	Version	23.3
	Bundle ID	com.automattic.alpha.woocommerce
	Commit	90ac9dc
	Installation URL	7i7f6uvkhjlfo

Automatticians: You can use our internal self-serve MC tool to give yourself access to those builds if needed.

[staskus]

✅ Tested on a device: iPad Air M2 26.0, all these images appear well.