Extended the 12.8.2 secret-value protection to the loot window and the need/greed roll UI. During
instanced encounters on Midnight (12.0), item links and their details can be "secret," and reading
them (to compare, measure, or list) would throw a Lua error. The loot list, auto-loot filters,
"Link All," and roll windows now detect secret values and degrade gracefully — a secret item still
shows and is lootable, just without the extra detail. No effect on normal loot or on Classic clients.
