Show 'Add New'/'Duplicate' form in a persistent side panel

[sven-n]

Summary

• Replaces the modal dialog used to create ("Add New") or duplicate configuration objects with a collapsible panel docked on the right side of the page. Because the panel lives in MainLayout, it survives page navigation — so a user can look up related data (on other pages) while filling in a new entry, then save. The panel can be collapsed/expanded with arrow buttons.
• Only one creation can be open at a time; starting another while one is in progress asks to discard the current one.

How it works

• New circuit-scoped CreationPanelService holds a single active CreationSession (item, type, context, save/cancel delegates) and raises StateChanged/ItemCreated events. CreationPanel.razor (in MainLayout) renders the form for the active session.
• The form body was extracted from ModalCreateNew into a reusable ItemCreationForm. ModalCreateNew now hosts it, so the remaining modal flows (account/user creation, plugin config) are unchanged.
• EditConfigGrid create/duplicate transfer their persistence context to the panel (the panel owns and disposes it) and reload the grid via the ItemCreated event.
• ItemTable's nested "Create" uses the same panel, but page-bound: it reuses the edit page's context and is cancelled when navigating away from that page (its context can't outlive the page).

Notes

• App.razor now also links the AdminPanel scoped-CSS bundle (_content/MUnique.OpenMU.Web.AdminPanel/...styles.css). The host (Startup.styles.css) only imports the library bundles, not AdminPanel's own scoped CSS, so the panel's styles weren't being delivered without this.
• Fixed the MonsterDefinition singular type caption from "Monsters" to "Monster" (also improves the edit-page heading).

Test plan

• Open a config grid (e.g. Monsters), click Add New → form appears in the right panel.
• Navigate to another page while the form is open → panel and entered data persist.
• Collapse/expand the panel with the arrow button.
• Submit → object is saved and the grid refreshes; Cancel discards it.
• Start a second create while one is open → prompted to discard the first.
• Duplicate an entry → panel pre-filled from the clone, saves correctly.
• Nested Create inside an edit form (e.g. a skill on a character) opens in the panel; navigating away cancels it.
• Existing modal flows (create account/user, plugin config) still work.

🤖 Generated with Claude Code

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request improves the user experience for creating and duplicating configuration objects by moving these workflows from transient modal dialogs to a persistent side panel. This change allows users to navigate the application while keeping their input data intact, significantly improving multitasking capabilities. The implementation introduces a centralized service to manage creation sessions and refactors existing form components to support this new UI pattern.

Highlights

• Persistent Creation Panel: Replaced modal dialogs for 'Add New' and 'Duplicate' actions with a persistent, collapsible side panel in the MainLayout, allowing users to navigate between pages while maintaining their creation progress.
• CreationPanelService: Introduced a new circuit-scoped service to manage the active creation session, handling state, persistence context, and lifecycle events across the application.
• Component Refactoring: Extracted the creation form logic into a reusable 'ItemCreationForm' component, simplifying the implementation for both the new side panel and existing modal flows.
• Bug Fixes: Corrected the 'MonsterDefinition' singular type caption and fixed a CSS delivery issue for the AdminPanel by explicitly linking the scoped stylesheet in App.razor.

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[gemini-code-assist]

Code Review

This pull request introduces a persistent side panel for creating and duplicating items, replacing the previous modal-based workflow. Key changes include the addition of a circuit-scoped CreationPanelService to manage creation sessions across page navigations, a new CreationPanel UI component, and the refactoring of creation logic into a reusable ItemCreationForm. Feedback focuses on ensuring that EditForm validation is properly enforced by using the OnValidSubmit event, improving resource management by wrapping context creation in try-catch blocks for reliable disposal, and correctly awaiting all subscribers of asynchronous events within the service.

[sven-n]

/gemini review

[gemini-code-assist]

Code Review

This pull request introduces a persistent side panel for object creation and duplication, replacing the previous modal-based workflow. Key additions include the CreationPanel component, a CreationPanelService for managing creation sessions across page navigations, and the ItemCreationForm for unified form handling. Feedback highlights an opportunity to optimize asynchronous calls in EditConfigGrid by removing unnecessary Task.Run usage. Additionally, several comments point out hardcoded strings in UI components and services that should be moved to resource files to support localization.