fix: prioritize plural localization over simple strings in LocalLocalizationExtractor and LocalizationProvider

[serhii-londar]

Closes #347

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[codecov]

Codecov Report

❌ Patch coverage is 97.10145% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 56.64%. Comparing base (4f98b07) to head (61e2457).

Files with missing lines	Patch %	Lines
...ization/Extractor/LocalLocalizationExtractor.swift	92.31%	1 Missing ⚠️
...K/Localization/Provider/LocalizationProvider.swift	92.31%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #379      +/-   ##
==========================================
+ Coverage   56.21%   56.64%   +0.43%     
==========================================
  Files         136      136              
  Lines        6377     6440      +63     
==========================================
+ Hits         3584     3647      +63     
  Misses       2793     2793              

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[Copilot]

Pull request overview

This PR addresses issue #347 by ensuring plural localizations from .stringsdict take precedence over simple .strings values when both define the same key, aligning SDK behavior with expected iOS pluralization rules.

Changes:

• Update LocalizationProvider.localizedString(for:) to prefer plural lookups before falling back to simple strings.
• Update LocalLocalizationExtractor.localizedString(for:) with the same plural-first lookup behavior.
• Add a regression test and a fallback .strings entry to simulate Crowdin exports where a plural key exists in both files.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
Tests/UnitTests/BundleStringTests.swift	Adds a regression test for plural precedence when a key exists in both .strings and .stringsdict.
Tests/Tests/en.lproj/Localizable.strings	Adds a fallback non-plural string for a key that also exists in .stringsdict, simulating Crowdin output.
Sources/CrowdinSDK/CrowdinSDK/Localization/Provider/LocalizationProvider.swift	Changes provider lookup order to check plurals first, then simple strings.
Sources/CrowdinSDK/CrowdinSDK/Localization/Extractor/LocalLocalizationExtractor.swift	Changes extractor lookup order to check plurals first, then simple strings.