WOOMOB-1645

@malinajirka @samiuelson @toupper FYI, it's better to use this, newly added, component when we need to display loading text

Description

This PR introduces a new WooPosShimmerText component that automatically measures text dimensions to create accurately sized shimmer loading placeholders. Previously, developers had to manually calculate text dimensions using WooPosShimmerBox, which was error-prone and led to inconsistent shimmer sizes.

The component:

• Uses rememberTextMeasurer() to automatically calculate the exact width and height of text based on style and font weight
• Automatically determines appropriate corner radius based on the calculated height
• Accepts an optional fontWeight parameter to ensure accurate measurement for bold text
• Reduces code duplication by replacing manual shimmer box calculations across the codebase

Updated the following screens to use WooPosShimmerText:

• Settings screens (Store and Local Catalog)
• Items list
• Cart screen
• Orders list and details

Test Steps

1. Open Woo POS and navigate to various screens with loading states
2. Observe that shimmer placeholders accurately match the size of the actual text that appears after loading
3. Verify shimmer sizes for both regular and bold text (e.g., product names, order titles)
4. Check that corner radius is appropriate for different text sizes

• 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.