Fix default browser detection for Windows 11 24H2 by checking UserChoiceLatest registry key (#40035)

## Summary

This PR fixes an issue where PowerToys Web Search and PowerToys Run
would always open Microsoft Edge instead of the user's default browser
on Windows 11 24H2, even when a different browser like Firefox was set
as the default.

## Root Cause

Windows 11 24H2 introduced a change where default browser associations
are now stored in a new registry location:
- **New location**:
`HKEY_CURRENT_USER\Software\Microsoft\Windows\Shell\Associations\UrlAssociations\http\UserChoiceLatest`
- **Old location**:
`HKEY_CURRENT_USER\Software\Microsoft\Windows\Shell\Associations\UrlAssociations\http\UserChoice`

PowerToys was only checking the old registry location, causing it to
fail to find the default browser and fall back to Microsoft Edge.

## Changes Made

Updated both `DefaultBrowserInfo.cs` files to check the new registry
location first, then fall back to the old location for backward
compatibility:

1. **Command Palette Web Search**:
`src/modules/cmdpal/ext/Microsoft.CmdPal.Ext.WebSearch/Helpers/DefaultBrowserInfo.cs`
2. **PowerToys Run**:
`src/modules/launcher/Wox.Plugin/Common/DefaultBrowserInfo.cs`

**Before**:
```csharp
var progId = GetRegistryValue(
    @"HKEY_CURRENT_USER\Software\Microsoft\Windows\Shell\Associations\UrlAssociations\http\UserChoice",
    "ProgId");
```

**After**:
```csharp
var progId = GetRegistryValue(
    @"HKEY_CURRENT_USER\Software\Microsoft\Windows\Shell\Associations\UrlAssociations\http\UserChoiceLatest",
    "ProgId")
    ?? GetRegistryValue(
        @"HKEY_CURRENT_USER\Software\Microsoft\Windows\Shell\Associations\UrlAssociations\http\UserChoice",
        "ProgId");
```

## Testing

- Verified the fallback logic works correctly with a test application
- Confirmed both affected files are updated with the same pattern
- Ensured backward compatibility with older Windows versions

## Impact

This fix ensures that:
- Users on Windows 11 24H2 will have their default browser respected
- Older Windows versions continue to work as before
- No breaking changes are introduced

Fixes #39794.

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src/modules/cmdpal/ext/Microsoft.CmdPal.Ext.WebSearch/Helpers/DefaultBrowserInfo.cs

@@ -79,8 +79,11 @@ public static class DefaultBrowserInfo
             try
             {
                 var progId = GetRegistryValue(
-                    @"HKEY_CURRENT_USER\Software\Microsoft\Windows\Shell\Associations\UrlAssociations\http\UserChoice",
-                    "ProgId");
+                    @"HKEY_CURRENT_USER\Software\Microsoft\Windows\Shell\Associations\UrlAssociations\http\UserChoiceLatest",
+                    "ProgId")
+                    ?? GetRegistryValue(
+                        @"HKEY_CURRENT_USER\Software\Microsoft\Windows\Shell\Associations\UrlAssociations\http\UserChoice",
+                        "ProgId");
                 var appName = GetRegistryValue($@"HKEY_CLASSES_ROOT\{progId}\Application", "ApplicationName")
                     ?? GetRegistryValue($@"HKEY_CLASSES_ROOT\{progId}", "FriendlyTypeName");
 

src/modules/launcher/Wox.Plugin/Common/DefaultBrowserInfo.cs

@@ -80,8 +80,11 @@ namespace Wox.Plugin.Common
                 try
                 {
                     string progId = GetRegistryValue(
-                        @"HKEY_CURRENT_USER\Software\Microsoft\Windows\Shell\Associations\UrlAssociations\http\UserChoice",
-                        "ProgId");
+                        @"HKEY_CURRENT_USER\Software\Microsoft\Windows\Shell\Associations\UrlAssociations\http\UserChoiceLatest",
+                        "ProgId")
+                        ?? GetRegistryValue(
+                            @"HKEY_CURRENT_USER\Software\Microsoft\Windows\Shell\Associations\UrlAssociations\http\UserChoice",
+                            "ProgId");
                     string appName = GetRegistryValue($@"HKEY_CLASSES_ROOT\{progId}\Application", "ApplicationName")
                         ?? GetRegistryValue($@"HKEY_CLASSES_ROOT\{progId}", "FriendlyTypeName");