fix: don't warn about missing id when a spread is present

[mogelbrod]

Description

Code like below currently triggers a "Missing message ID, skipping" warning on lingui extract, even though it works and is a decent workaround to use placeholders in lazy lookups:

const lookup = {
  x: msg`x {val}`,
  generic: msg`generic {val}`,
}

function X() {
  const { i18n } = useI18n()
  return i18n._({
    ...(lookup.x ?? lookup.generic),
    values: { val: 'test' },
  })
}

I'd like to propose that we stop reporting missing IDs when a spread is also present in the object passed to the i18n._ call.

If this is accepted I'll happily provide patches for the experimental extractor along with the SWC extractor.

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Examples update

Checklist

• I have read the CONTRIBUTING and CODE_OF_CONDUCT docs
• I have added tests that prove my fix is effective or that my feature works
• I have added the necessary documentation (if appropriate)

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Project	Deployment	Actions	Updated (UTC)
js-lingui	Ready	Preview	Jun 24, 2026 4:35pm

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.79%. Comparing base (6bb8983) to head (d2f1b42).
⚠️ Report is 354 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #2581       +/-   ##
===========================================
+ Coverage   77.05%   89.79%   +12.74%     
===========================================
  Files          84      124       +40     
  Lines        2157     3695     +1538     
  Branches      555     1110      +555     
===========================================
+ Hits         1662     3318     +1656     
+ Misses        382      339       -43     
+ Partials      113       38       -75     

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