implement changes to shared access

[SharonStrats]

Implement the shared with area, so that a user can change existing access. Plus some cleanup.

Some notes:

• you'll see we don't have the search icon in the search box. When I first implemented it I added it to the solid-ui-input, because that is what I was using but then I realized I needed the combobox. In order to add it in again I'd need to modify the combobox. I'm going to leave it and we can discuss it at the end.
• Also I'm thinking that the search box should be wider than the design. I'll leave it for now, but I will bring it up later or maybe just change it. I'll see at the end.
• Also wondering about the font, seems a bit too big but this was from design. 14px.

Here is how the search looks

[Copilot]

Copilot review overview

🟡 Changes recommended

Saving a multi-subject authorization updates only its first subject.

Review effort: Balanced
Findings: 1

Open (1)

• Authorization edits update only the first subject · New

What changed in this PR

Implements editing and saving existing shared-access grants in the access-control modal.

Changes:

• Enables saving modified grant roles.
• Adds unified planner support for origin grants.
• Updates grant rendering and tests.

File	Description
AccessControlModal.ts	Tracks and persists edited access roles.
access-control-modal.test.ts	Tests origin and existing-grant updates.

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[timea-solid]

LG