[BUG] Kanban board fails to render when a column contains more than 3000 cards

[13werwolf13]

Title: Kanban board fails to render when a column contains more than 3000 cards

Problem description: If a single column on the Kanban board contains more than ~3000 cards, the frontend fails to render them. The interface becomes unresponsive or completely freezes, making it impossible to work with tasks in that column.

Steps to reproduce:

1. Create a project with a Kanban board.
2. Add more than 3000 cards to a single column.
3. Open the Kanban board.

Actual result: Cards are not displayed; the page freezes or stops responding.

Expected behavior: Cards should be loaded gradually (lazy loading / infinite scroll) as the user scrolls down, so the interface remains responsive.

Proposed solution: Implement lazy loading for cards — for example, render the first 100–200 and load more as the user scrolls. This will improve performance and allow working with large backlogs without UI freezes.

Additional information:

• Taiga version: 6.9.0
• Browser: chrome, vivaldi, firefox
• Screenshots or logs (if any):

P.S.: I don’t know English very well, so I used AI to translate this text. Sorry if it made the text less readable.