fix: add A → a replacement in dateFns localeParse for use12Hours

[daedalus28]

Summary

• Add missing .replace(/A/g, 'a') to localeParse in the date-fns generate config
• Fixes use12Hours crashing with RangeError: Format string contains an unescaped latin alphabet character A

localeParse already converts moment.js format tokens to date-fns equivalents (Y→y, D→d, etc.) but was missing A→a (AM/PM). When use12Hours is enabled, rc-picker injects uppercase A into the format string internally, which date-fns rejects.

Fixes #964

Summary by CodeRabbit

• Bug Fixes

  • 优化了日期格式规范化，兼容将 AM/PM 标记大写 A 视为小写 a 进行处理，提升日期解析与格式化的一致性与稳定性。

• Tests

  • 新增针对 date-fns 的单元测试，覆盖大写 A 在格式化与解析中的行为，验证输出与解析结果正确且一致。

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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

Run ID: 5fb8ede1-2135-4b94-aae8-76c25816e7b7

📥 Commits

Reviewing files that changed from the base of the PR and between 582a66b and 935095a.

📒 Files selected for processing (1)

• tests/generate.spec.tsx

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Walkthrough

在 localeParse 的格式预处理链中新增对 AM/PM 令牌的正规化：将所有大写 A 替换为小写 a；同时新增 date-fns 专用单元测试，验证在含大写 A 的 12 小时制格式下格式化与解析正常工作（验证输出 PM 且能解析回 14:30）。

Changes

Cohort / File(s)	Summary
日期格式转换修复 src/generate/dateFns.ts	在 localeParse 的链式替换中添加 .replace(/A/g, 'a')，将 moment 风格的大写 AM/PM 令牌转换为 date-fns 期望的小写 a，避免未转义字母导致的解析错误。
新增/更新测试 tests/generate.spec.tsx	新增 date-fns 专用测试，使用 YYYY-MM-DD hh:mm:ss A 格式：确认格式化结果包含 PM 且使用相同格式能成功解析回小时 14 与分钟 30。

Sequence Diagram(s)

（省略 — 本次变更为格式字符串替换与测试，交互组件不足以生成序列图。）

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Suggested reviewers

• afc163

诗句

🐰 我在格式里轻轻跳，
把大写的 A 换成小写的 a，
午后标记回到应有的位置，
时针安心，分钟轻声笑，
解析稳稳不再慌。

🚥 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	The title accurately describes the main change: adding A → a replacement in dateFns localeParse for use12Hours support.
Linked Issues check	✅ Passed	The code changes fully implement the fix specified in issue #964: adding .replace(/A/g, 'a') to localeParse and including a test case verifying 12-hour format functionality.
Out of Scope Changes check	✅ Passed	All changes are directly related to fixing the A → a token replacement issue in dateFns localeParse; no out-of-scope modifications detected.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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[gemini-code-assist]

Code Review

This pull request updates the localeParse function in src/generate/dateFns.ts to replace the 'A' format token with 'a', ensuring compatibility with date-fns for 12-hour time formats. I have no feedback to provide.

[afc163]

Could you add a test case?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.81%. Comparing base (738bcac) to head (935095a).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #965   +/-   ##
=======================================
  Coverage   98.81%   98.81%           
=======================================
  Files          65       65           
  Lines        2695     2695           
  Branches      724      749   +25     
=======================================
  Hits         2663     2663           
  Misses         29       29           
  Partials        3        3           

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[daedalus28]

Could you add a test case?

Done 👍

[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@tests/generate.spec.tsx`:
- Around line 342-344: The comment incorrectly states the output will be
lowercase am/pm while the assertion expects uppercase "PM"; update the comment
in tests/generate.spec.tsx near the dateFnsGenerateConfig.locale.format('en_US',
date, 'YYYY-MM-DD hh:mm:ss A') test to explain that the test verifies token
mapping/format-token behavior (that the 'A' token is handled) rather than
asserting a case change of the am/pm output, so it doesn't claim lowercase
output.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 82e058b4-cb2d-4306-bedd-a042b8039e07

📥 Commits

Reviewing files that changed from the base of the PR and between cb2f157 and 582a66b.

📒 Files selected for processing (1)

• tests/generate.spec.tsx

[daedalus28]

@afc163 Is there anything you need for this? This is a real issue affecting everyone using date-fns with a 12 hour picker.