fix: default missing horizontal offset

[nrps9909]

Summary

• default the optional horizontal filler offset to zero before negating it
• cover both LTR and RTL margin properties when offsetX is omitted

Why

FillerProps.offsetX is optional, but the virtual positioning branch negated it directly. Rendering that supported state produced React's NaN is an invalid value for the marginLeft css style property warning and omitted the intended zero margin.

Closes#298.

Validation

• exact-base regression: failed with the React NaN warning and missing zero margin
• focused regression: 2/2 passed for LTR and RTL
• full test suite: 9 suites, 282 tests passed
• TypeScript, focused ESLint, Prettier, ESM/CJS/declaration compilation, and diff checks passed

AI assistance disclosure: Codex was used to trace the offset path, construct the failing regression, implement the minimal fallback, run validation, and draft this PR. I reviewed the diff and all reported results before submission.

Summary by CodeRabbit

• Bug 修复

  • 修复未提供水平偏移量时可能生成无效样式的问题。
  • 在不同文字方向下，内容默认正确设置为 0px 外边距。

• 测试

  • 新增测试，覆盖省略水平偏移量时的默认表现。

[vercel]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.60%. Comparing base (579a3bf) to head (8f3cb45).

Additional details and impacted files

@@ Coverage Diff @@## master #384 +/- ##
=======================================
Coverage 97.60% 97.60% =======================================
Files 19 19 Lines 836 836 Branches 209 205 -4 =======================================
Hits 816 816 Misses 20 20 

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: aa113d97-2fe7-4c80-8b65-98a455516212

📥 Commits

Reviewing files that changed from the base of the PR and between 82a99ec and 8f3cb45.

📒 Files selected for processing (1)

• src/Filler.tsx

🚧 Files skipped from review as they are similar to previous changes (1)

• src/Filler.tsx

Included review availability: Your plan provides up to 4 included reviews per hour; 2 remain after this review.

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Walkthrough

Filler 在 offsetX 未定义、为空或为 0 时使用 0 计算水平 margin。新增测试验证 rtl 为 false 和 true 时的默认 margin。

Changes

Filler 水平偏移处理

Layer / File(s)	Summary
水平偏移默认值与测试 src/Filler.tsx, tests/filler.test.tsx	innerStyle 使用 `-offsetX

Estimated code review effort: 1 (Trivial) | ~5 minutes

Merge Risk:⚪ Minimal · up to 8f3cb

The change defaults an omitted horizontal offset to zero for both LTR and RTL rendering, preventing the reported invalid CSS value. No actionable merge-blocking risk remains after the stated validation.

Poem

小兔看到偏移归零，
Filler 计算不再出错。
左边右边各有默认，
测试覆盖两种方向。
NaN 警告安静躲好。

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	标题准确概括了本次变更：为缺失的水平偏移设置默认值。
Linked Issues check	✅ Passed	变更解决了问题 #298。代码在缺少 offsetX 时将水平边距设为 0，避免产生 NaN。LTR 和 RTL 场景均有回归测试。
Out of Scope Changes check	✅ Passed	变更仅包含 Filler.tsx 的相关修复和对应的 LTR/RTL 测试。未发现与问题 #298 无关的代码变更。
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 2…

Full details: Docstring Coverage

Explanation

No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 2 files.

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests

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