[Feature request] More explicit link management

[Chronial]

First of thanks for this amazing tool ❤️. Your modelling of "Links" is clearly best-in-class. Neither Hellmod nor Factory Planner can compete in this category. For my feature request:

As far as I understand, a certain item can be marked as "linked" in any subgroup and in the main group. But this seems to be neither clearly viewable nor editable. Assuming this structure, with groups A, B, C and items 1, 2, 3. 4

• A (linked: 1)
  • B (linked: 2)
    • C (linked: 3)

Viewing

Clicking on item 2 in group C will tell me that it is linked outside that subgroup, but it will not tell me in which parent group it is linked. It would be very nice to be able to see that.

Editing

Clicking on item 4 in group C, there is no way to create a link for item 4 in group A. It is possible if item 4 is currently considered an ingredient or product of group B. But it often is not, as 0 of it are produced due to the missing link. Replacing the "create link" button with a set of buttons to create the links at the different parent levels would solve this issue.

Design

Currently the menu looks like this:

Add consumption recipe
===============
...

Add production recipe
==============
...
| View Link summary |
... is currently linked, but ...
| Create Link |

It could be extended to

Add consumption recipe
===============
...

Add production recipe
==============
....

Links
===
| View Link summary |
... is currently linked at the root table level, but ...
Or ... is currently linked x nestings higher, but ...
Or ... is currently linked in this nested table ...
| Link within this nested table |
| Link 1 level higher |
| Link 2 levels higher |
....
| Link in the root table |