Redesign share sidebar panel

[JammingBen]

Initial Checklist

• I understand this is a user story and questions should be posted in the Community Discussions
• I searched issues and couldn’t find anything (or linked relevant results below)

User Story

As a user, I want my OpenCloud UI to have a nice and modern look & feel so that I have an easy time using it.

User Value

UI/UX

Acceptance Criteria

• the shares panel of the right sidebar should visually match the screenshot below
  • ignore the different font-sizes in the screenshot (for now)

Note: the top bar ("General") is not part of this story (see #2126)!