Fix race condition in registry editor navigation on first launch

[Copilot]

When regedit is launched for the first time, Process.Start() returns before the window hierarchy is fully initialized. The code attempted to send navigation messages to window handles that were still IntPtr.Zero, causing silent failure.

Changes

• Add retry logic for main window handle acquisition: After process start, poll MainWindowHandle with Refresh() for up to 5s (50×100ms)
• Add retry logic for child control discovery: Poll FindWindowEx() for tree/list views for up to 5s before sending navigation messages
• Extract retry constants: MAX_WINDOW_WAIT_RETRIES and MAX_CHILD_WINDOW_WAIT_RETRIES for maintainability

// Before: Immediate access, often IntPtr.Zero
process = Process.Start("regedit.exe", "-m");
process.WaitForInputIdle();
hMain = process.MainWindowHandle;  // May be Zero

// After: Wait for handle availability
process = Process.Start("regedit.exe", "-m");
process.WaitForInputIdle();
int retries = MAX_WINDOW_WAIT_RETRIES;
while (retries-- > 0) {
    process.Refresh();
    hMain = process.MainWindowHandle;
    if (hMain != IntPtr.Zero) break;
    Thread.Sleep(100);
}
if (hMain == IntPtr.Zero) return;

This also fixes the case where regedit is already open but window handles become stale between calls.

Original prompt

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This section details on the original issue you should resolve

<issue_title>[Bug]: 注册表无法定位到具体值</issue_title>
<issue_description>### Checklist

• This bug has not already been reported (search here)
• I have updated ContextMenuManager to the latest version
• I understand that any issue not following the guidelines may be closed directly

Windows

Windows 11

Version

3.6.2.0

Steps to Reproduce

Video_2026-01-27_000444.mp4

复现方法：
已上传视频为附件，首先不要运行regedit，如果运行着的要关闭掉，随便一项，点击齿轮，在弹出菜单中点击【详细信息-注册表位置】。此时只打开了regedit，并不会定位到对应的注册表值。
保留regedit窗口，再次点击【注册表位置】，此时才能定位到对应的注册表值。

我不知道为什么会这样，测试了两台机器，依旧如此。老版的3.3.3.1也有同样的问题。

Crash logs

No response</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes [Bug]: 注册表无法定位到具体值 #79

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[Copilot]

Pull request overview

This PR fixes a race condition that occurs when launching the Windows Registry Editor (regedit) for the first time. The issue occurred because Process.Start() returns before the window hierarchy is fully initialized, causing attempts to send navigation messages to window handles that were still IntPtr.Zero, resulting in silent failure.

Changes:

• Added retry logic with polling for main window handle acquisition (up to 5 seconds with 50 retries × 100ms each)
• Added retry logic with polling for child control discovery (tree view and list view controls, also up to 5 seconds)
• Extracted retry constants MAX_WINDOW_WAIT_RETRIES and MAX_CHILD_WINDOW_WAIT_RETRIES for better maintainability

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