[Woo POS] Calculate and Display Order Totals on Totals Screen

[backwardstruck]

Closes: #11694

Description

Implements the calculation and display of order totals on the Totals screen. After order ID is passed from the cart screen to the totals screen, the relevant order data is retrieved from the database, and then the totals (subtotal and tax) are calculated and displayed.

PR is based on PR #11717, which should be merged first.

Follow up work to clean up UI and formatting will be done in this ticket:

[Woo POS] Update Totals View UI with Subtotals from Cart Total

Steps to reproduce

0. Go to the POS screen in settings.
1. Add items to the cart.
2. Tab button to checkout.
3. Observe the displayed totals, including the subtotal and tax.

Testing information

Scenarios to test:

• Adding items to the cart and navigating to the Totals screen.
• Verifying that the correct totals (subtotal and tax) are calculated and displayed.

Devices tested:

• Android Emulator (tablet, Pixel phone)

Images/gif

• 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.

[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
	Flavor	Jalapeno
	Build Type	Debug
	Commit	59cb5e4
	Direct Download	woocommerce-prototype-build-pr11720-59cb5e4.apk

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 30 lines in your changes missing coverage. Please review.

Project coverage is 40.22%. Comparing base (f040b34) to head (4278021).

❗ Current head 4278021 differs from pull request most recent head a81e7c0

Please upload reports for the commit a81e7c0 to get more accurate results.

Files	Patch %	Lines
...oid/ui/woopos/home/totals/WooPosTotalsViewModel.kt	0.00%	27 Missing ⚠️
...android/ui/woopos/home/totals/WooPosTotalsState.kt	0.00%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##              trunk   #11720      +/-   ##
============================================
- Coverage     40.24%   40.22%   -0.02%     
  Complexity     5331     5331              
============================================
  Files          1132     1132              
  Lines         65288    65317      +29     
  Branches       9056     9057       +1     
============================================
  Hits          26273    26273              
- Misses        36594    36623      +29     
  Partials       2421     2421              

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[samiuelson]

Good progress @backwardstruck! I added some improvement ideas. Let me know what you think.

[backwardstruck]

Thanks for the feedback @samiuelson This is now updated.

[samiuelson]

🚀 Looks good @backwardstruck! I proposed a few more improvements that you can consider implementing though.

[dangermattic]

	1 Warning
⚠️	This PR is assigned to the milestone 19.2. 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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