MWPW-201776: MAS Chrome extension - detect prices, CTAs and OSIs outside merch cards

[Axelcureno]

Extends the MAS Chrome extension's card-detector to also surface bare inline-price/checkout-link/checkout-button elements (data-wcs-osi) outside merch-card, which today are invisible despite being most MAS content on product pages. Reuses existing cancel-context promo handling unchanged.

Resolves https://jira.corp.adobe.com/browse/MWPW-201776
QA Checklist: https://wiki.corp.adobe.com/display/adobedotcom/M@S+Engineering+QA+Use+Cases

• C1. Cover code with Unit Tests
• C2. Add a Nala test (extension isn't in Nala scope; confirm with #fishbags)
• C3. Verify all Checks are green (71/71 unit tests, merge-checked against main)
• C4. PR description contains working Test Page link
• C5. Ready to demo from Test Page
• C.6 Re-read Jira to confirm all ACs addressed

Test: no deployed branch URL applies (browser extension). Load unpacked from this branch (chrome://extensions) against any page with a standalone inline-price/checkout-link/checkout-button. Not yet smoke-tested live in browser — flagging before merge/QA.

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Commits

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.74%. Comparing base (2f2e131) to head (42b447e).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1193      +/-   ##
==========================================
+ Coverage   90.71%   90.74%   +0.02%     
==========================================
  Files         318      318              
  Lines      101712   101712              
==========================================
+ Hits        92271    92300      +29     
+ Misses       9441     9412      -29     

see 4 files with indirect coverage changes

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[mirafedas]

Tested on https://www.adobe.com/express/?promoid=Y69SGP43&mv=other and https://www.adobe.com/products/illustrator.html , prices and CTAs outside merch cards are detected correctly ✅

[seanchoi0]

Looks good overall, approving! One thing worth a quick check — overlay.js renders the "Additional details" section unconditionally in the template, but if (isBareElement) return (around line 130) exits before the toggle listener gets attached. Might be worth verifying that clicking it on a price/cta panel behaves as expected.