Feature: Space settings and structure management

[mjkatgithub]

Goal

Provide practical space settings to manage metadata and channel structure.

Scope

• Add settings for space name, topic, and avatar
• Add structure controls for categories/rooms ordering in space context
• Persist settings changes and update dependent views

Branch

feature/space-settings-structure

Acceptance Criteria

• Users can edit core space metadata in a dedicated settings flow
• Structure/order changes are applied and remain stable after reload
• Related navigation and room views reflect settings updates immediately

Test Checklist

Unit

• Metadata update mapping and validation
• Structure/order transformation and persistence logic

Integration

• Settings changes propagate to rail and room list components
• Order changes remain consistent with existing DnD behavior

E2E

• Update space metadata and verify visible UI updates
• Change structure/order and verify persistence after reload

Notes

• Coordinate with existing DnD feature issues to avoid duplicate behavior.