Initial commit

[Edwz208]

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[Copilot]

Pull request overview

This PR refactors the frontend item typings and filtering to prefer undefined over null, expands the items API client to support admin CRUD endpoints, and adds a small backend enhancement to expose box_code in public item serialization (plus some minor UI/CSS tweaks).

Changes:

• Update catalogue filters to use undefined for “unset” values and align filter typing.
• Replace PublicCollectionItem usage in some components with a new CollectionItem type and expand itemsApi with CRUD methods.
• Backend: expose box_code on PublicCollectionItemSerializer.

Reviewed changes

Copilot reviewed 14 out of 14 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
frontend/src/pages/public/CataloguePage.tsx	Initializes catalogue filters using undefined values.
frontend/src/lib/types.ts	Replaces placeholder item type(s) with ItemType/ItemStatus + new CollectionItem shape.
frontend/src/lib/filters.ts	Changes filter field types and removes null from several filter params.
frontend/src/index.css	Adds light-blue accent CSS variables.
frontend/src/components/layout/Header.css	Hides .header-nav on small screens.
frontend/src/components/items/ItemList.tsx	Switches item list typing to CollectionItem[].
frontend/src/components/items/ItemCard.tsx	Switches item card typing to CollectionItem.
frontend/src/components/items/ItemDetailCard.tsx	Adds a new item details card component.
frontend/src/components/items/DetailRow.tsx	Adds a new reusable detail row component.
frontend/src/components/items/CatalogueSearchBar.tsx	Uses undefined instead of null when clearing filters; adjusts search input handling.
frontend/src/components/common/Button.tsx	Adds hideMobile prop to hide buttons on small screens.
frontend/src/api/items.api.ts	Adds create/update/patch methods and changes item response typing/endpoint usage.
frontend/src/actions/useItems.ts	Minor cleanup of queryFn comment.
backend/inventory/serializers.py	Adds box_code to the public item serializer output.

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