AdminPanel: Filter skill dropdown by character class when adding learned skills

[Copilot]

• Create SkillEntryCreationForm.razor component that filters skills by character class
• Modify ItemTable.razor.cs to extract parent owner from ValueExpression and pass to ModalCreateNew
• Modify ModalCreateNew.razor to accept an Owner parameter and use SkillEntryCreationForm when creating SkillEntry with a Character owner
• Fix crash: Skill.Name is LocalizedString (not IComparable); use GetName() extension to sort alphabetically

Original prompt

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This section details on the original issue you should resolve

<issue_title>AdminPanel: When adding skills, only show options that are allowed for the class</issue_title>
<issue_description>Is your feature request related to a problem? Please describe.
When editing a character's skills, the drop down shows skills of all character class.
It's hard to know which skill is allowed for that class.
User also needs to know the skill names when using the search text box.
(There is also that 'Level' field which I'm not sure what for)

Describe the solution you'd like
When adding skills, only show options that are allowed for the class.
(This is probably a subset of things to do in #561)

Describe alternatives you've considered
Alternatively, list all skills with checkbox markers whether it is learned or not

Additional context

</issue_description>

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

• Fixes AdminPanel: When adding skills, only show options that are allowed for the class #615

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[sven-n]

@copilot When clicking the create button, the following error appears:

[2026-03-20T22:44:26.778Z] Error: System.InvalidOperationException: Failed to compare two elements in the array.
 ---> System.ArgumentException: At least one object must implement IComparable.
   at System.Collections.Comparer.Compare(Object a, Object b)
   at System.Collections.Generic.ObjectComparer`1.Compare(T x, T y)
   at System.Linq.Enumerable.EnumerableSorter`2.CompareAnyKeys_DefaultComparer_NoNext_Ascending(Int32 index1, Int32 index2)
   at System.Collections.Generic.ArraySortHelper`1.PickPivotAndPartition(Span`1 keys, Comparison`1 comparer)
   at System.Collections.Generic.ArraySortHelper`1.IntroSort(Span`1 keys, Int32 depthLimit, Comparison`1 comparer)
   at System.Collections.Generic.ArraySortHelper`1.Sort(Span`1 keys, Comparison`1 comparer)
   --- End of inner exception stack trace ---
   at System.Collections.Generic.ArraySortHelper`1.Sort(Span`1 keys, Comparison`1 comparer)
   at System.Linq.Enumerable.EnumerableSorter`2.QuickSort(Int32[] keys, Int32 lo, Int32 hi)
   at System.Linq.Enumerable.EnumerableSorter`1.Sort(TElement[] elements, Int32 count)
   at System.Linq.Enumerable.OrderedIterator`1.Fill(TElement[] buffer, Span`1 destination)
   at System.Linq.Enumerable.OrderedIterator`1.ToList()
   at MUnique.OpenMU.Web.Shared.Components.Form.SkillEntryCreationForm.OnParametersSet() in C:\Users\Sven\Documents\GitHub\OpenMU\src\Web\Shared\Components\Form\SkillEntryCreationForm.razor:line 79
   at Microsoft.AspNetCore.Components.ComponentBase.RunInitAndSetParametersAsync() blazor.web.ax6tuj8tun.js:1:42438
    log http://localhost/_framework/blazor.web.ax6tuj8tun.js:1
    unhandledError http://localhost/_framework/blazor.web.ax6tuj8tun.js:1
    startConnection http://localhost/_framework/blazor.web.ax6tuj8tun.js:1
    _invokeClientMethod http://localhost/_framework/blazor.web.ax6tuj8tun.js:1
    _processIncomingData http://localhost/_framework/blazor.web.ax6tuj8tun.js:1
    onreceive http://localhost/_framework/blazor.web.ax6tuj8tun.js:1
    onmessage http://localhost/_framework/blazor.web.ax6tuj8tun.js:1

[Copilot]

@copilot When clicking the create button, the following error appears:

[2026-03-20T22:44:26.778Z] Error: System.InvalidOperationException: Failed to compare two elements in the...

Fixed in bef8f9d. Skill.Name is a LocalizedString which doesn't implement IComparable, so OrderBy(s => s.Name) failed at sort time. Changed to OrderBy(s => s.GetName()) which uses the ObjectExtensions.GetName() method returning a plain string.