Update inner segment handling for "n" segment

[wengxt]

Summary by CodeRabbit

• Bug Fixes

  • Improved pinyin parsing for inputs containing ambiguous “n” segments.
  • Corrected segmentation behavior for partial-final and inner-short fuzzy matching.

• Tests

  • Added coverage for multiple valid segmentations of “xiana,” including “xian-a,” “xia-na,” and “xi-a-na.”

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: fcdd89f5-5d1b-4977-b777-7b4c28b1d2f3

📥 Commits

Reviewing files that changed from the base of the PR and between b03681a and fe8e179.

📒 Files selected for processing (2)

• src/libime/pinyin/pinyinencoder.cpp
• test/testpinyinencoder.cpp

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📝 Walkthrough

Walkthrough

Changes

Pinyin segmentation correction

Layer / File(s)	Summary
Inner segment transitions and regression coverage src/libime/pinyin/pinyinencoder.cpp, test/testpinyinencoder.cpp	Updates "n" inner-segment transition handling and adds "xiana" segmentation assertions for PartialFinal and InnerShort.

Estimated code review effort: 2 (Simple) | ~10 minutes

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title matches the main code change: special handling for inner segments with "n" was updated.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

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🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch new-inner

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