feat(indicators): add a refreshed-state sparkle variant

[rfizzle]

Problem

The world overlay is binary: the same gold sparkle means both "never looted" and "restocked for you." When loot refresh re-arms a container, a returning player can't tell "I missed this chest" from "this chest refreshed for me." The looted/refreshed distinction currently surfaces only through Jade/WTHIT — optional third-party mods most players won't have — so the loot-refresh feature never advertises itself in the world.

Proposed behavior

Refresh-expired containers render a visually distinct sparkle variant. Proposal: keep the gold body but swap the diamond-cyan core to green, matching the green "Refreshed" status text in the Jade/WTHIT tooltip so the two surfaces speak the same color language. One extra animated strip authored through the glyph pipeline; the per-chunk indicator sync carries one extra bit per entry (unlooted vs refreshed).

Acceptance criteria

• A never-looted container shows the existing gold/cyan sparkle
• A refresh-expired container shows the refreshed variant; opening it clears the indicator as today
• The distinction survives relog and chunk reload
• With enableLootRefresh off, indicator behavior and network payloads are identical to today

Out of scope

• New indicator states beyond these two (looted and vanilla containers still render nothing)
• Jade/WTHIT changes (already distinguish the states)

Docs impact

site/pages/features.json (indicators and loot-refresh sections), site/pages/guide.json §3 "Reading the Indicators".