feat: client-side collection load limits with 'Load more' button

[albertodainotti]

Summary

Adds client-side support for Notion's inline_collection_first_load_limit format property. When a collection view has a load limit configured, only the first N items are shown initially, with a "Load more" button to reveal the rest.

Changes

• collection-view-gallery.tsx: Added load limit logic with useState for expand state, renders "Load more" button with chevron icon when items exceed the limit
• collection-view-table.tsx: Same load limit pattern applied to table views
• collection-view-list.tsx: Same load limit pattern applied to list views
• styles.css: Added styles for .notion-collection-load-more button (hover effect, spacing, cursor)

How It Works

1. Reads inline_collection_first_load_limit.limit from the collection view's format
2. If a limit is set and there are more items than the limit, shows only the first N items
3. Renders a "Load more" button below the collection
4. On click, reveals all items (one-time expand, no pagination)

Motivation

Notion allows setting a "load limit" on inline collections to keep pages compact. Without this feature, all collection items are rendered immediately regardless of the Notion-configured limit, which can result in very long pages.

[vercel]

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