Add gem quality for matching socket based on equipped item

[vaisest]

Description of the problem being solved:

3.29 added a mechanic where gems that are in the matching colour sockets adds +10% quality. This PR adds handling for that, and in general socket-related things which are actually relevant because of that change.

Steps taken to verify a working solution:

• Matching gems tested
• "White" gems tested -> no quality is added. In the future if GGG happens to add a bonus for these, it should be easy to add
• On load, quality is added correctly. Skills are loaded before items, but the matching sockets are separately checked.
• Quality is added when equipping or unequipping items
• Quality is communicated through coloured gem quality edit boxes
• Quality is separated by type in tooltips similar to the way they are in in-game tooltips
• Split links (i.e., multiple groups per item) are handled by assuming that they are kept in the correct order
• Dialla's malefaction always grants the bonus
• Optimise sockets button makes the colours correct on an equipped item, and doesn't make the item have too many sockets

Currently this PR does NOT handle empty sockets at all. This is clearly problematic since the gems will not match the correct sockets if the gaps are missing, but solving this for sure requires changing the way socket groups are handled or saved, and so I think it's best done later in a separate PR. This PR intentionally makes no changes to the way gems are saved.

Link to a build that showcases this PR:

Nearly any character should work.

Dialla's: https://poe.ninja/poe1/builds/allflame?items=Dialla%27s+Malefaction

All 4 types of quality at once (ground slam group): https://poe.ninja/poe1/pob/9519e

Before screenshot:

After screenshot:

Path.space.of.space.Building_2026-08-02_17-07-30.mp4