Product Editor: Feedback bar is mis-aligned; transient notices overlap

[mattsherman]

Prerequisites

• I have carried out troubleshooting steps and I believe I have found a bug.
• I have searched for similar bugs in both open and closed issues and cannot find a duplicate.

Describe the bug

In #39055, regressions were introduced that broke the alignment of the feedback bar content... it used to line up with the form (same left/right margins). It now is offset...

It also broke the positioning of the snackbar notices... they should appear above the feedback bar (they did). They no longer do -- they now overlap the feedback bar (they shouldn't).

Original PRs where feedback bar and snackbar notice positioning were implemented, for reference:

• Show feedback footer on product editor page #38599
• Fix transient notices overlapping product editor footer (take 2) #38698

Expected behavior

• The feedback bar is aligned according to the design and original implementation.
• The transient notices appear above the feedback bar.

Actual behavior

• The feedback bar is mis-aligned.
• The transient notices overlap the feedback bar.

Steps to reproduce

1. Make sure the New product editor feature is active under /wp-admin/admin.php?page=wc-settings&tab=advanced&section=features
2. Make sure woocommerce_block_product_tour_shown is set to no and woocommerce_product_editor_show_feedback_bar is set to yes under /wp-admin/tools.php?page=woocommerce-admin-test-helper so WCA Test Helper should be installed
3. Visit /wp-admin/admin.php?page=wc-admin&path=/add-product you should see the welcome modal with title Welcome to the new product form! and description Discover its new features and improvements with a quick overview of what's included.
4. Dismiss the welcome modal.
5. Verify the feedback bar is mis-aligned.
6. Save a product draft.
7. Verify the transient notice overlaps the feedback bar.

WordPress Environment

All environments

Isolating the problem

• I have deactivated other plugins and confirmed this bug occurs when only WooCommerce plugin is active.
• This bug happens with a default WordPress theme active, or Storefront.
• I can reproduce this bug consistently using the steps above.