feat: move feed to new category in context menu

[CanglongCl]

Description

Allows move feed to new category in context menu. This improves feed category setting on mobile, which does not allow drag and drop.

It also helps quickly create a new category.

PR Type

• Feature
• Bugfix
• Hotfix
• Other (please describe):

Linked Issues

Additional context

Changelog

• I have updated the changelog/next.md with my changes.

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Suggested PR Title:

feat(feed): add category management for subscriptions

Change Summary:
Enhances feed actions by adding category management; introduces a modal for creating new categories and updates subscription hooks to handle multiple feeds efficiently.

Code Review:
No change requests necessary.

[Innei]

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