Closes #66
Relates to #63


The UI differs a fair bit from the wireframes & figma designs in the interest of being able to use the stock SwiftUI Table view. The biggest difference is that a modal is used to insert new file syncs, as opposed to creating them inline. This was done as it's a lot harder to do that within a SwiftUI table. This design is also consistent with tables used in Apple's own settings pages, and the HTTP header table in app settings.


https://github.com/user-attachments/assets/7c3d98b9-36c4-430b-ac6f-7064b6b8dc31

The UI is mostly non-functional, it still needs to be wired up over gRPC, including conversions from Mutagen data types.
As a result, the file sync button on the menu will not appear unless the file sync feature flag is enabled in settings.

Right now, the workspace dropdown menu is populated from the online agents (any row with a coloured dot on the menubar menu)

There's no tests for this since ViewInspector still does not support Tables.

Relates to #63.

This allows a Mutagen `Synchronization/State` message to be displayed as a single row in the table.

Just like on the Windows app, extra details are shown on hover. Though all columns can be expanded by dragging the column separators, full paths will also be shown on hover.

<img width="905" alt="Screenshot 2025-03-20 at 6 20 10 pm" src="https://github.com/user-attachments/assets/c3a51296-54e3-48c7-b3f6-9c915ba1b1a0" />
<img width="903" alt="Screenshot 2025-03-20 at 6 21 48 pm" src="https://github.com/user-attachments/assets/2cf9cd9f-6349-42f2-abcd-b354126aafda" />
<img width="906" alt="Screenshot 2025-03-20 at 6 21 40 pm" src="https://github.com/user-attachments/assets/ab6a50f5-9018-4712-be8c-9f6ad3ce44d0" />
<img width="906" alt="Screenshot 2025-03-20 at 6 20 18 pm" src="https://github.com/user-attachments/assets/7d5bb734-4a40-4897-a7ac-86513501b1ce" />
<img width="904" alt="image" src="https://github.com/user-attachments/assets/fdb1f2f8-7b70-4a78-9fb9-ac84df4ca5af" />

Relates to #63.

The daemon requires this prompting communication channel be open during all requests.

Closes #63.