Wire's Forge of Potential Rework

Reworks the Forge of Potential while keeping Valheim's normal item stat and quality formulas and all three Forge outcome types.

• The first Potential attempt has a 90% parent win chance.
• Potential +1 is 95%, then success falls by 5 percentage points per existing Potential level.
• Success chance never drops below Valheim's reported 65% Forge success rate.
• Potential +7 is the first 65% tier.
• Potential +8 is the second consecutive 65% tier (the attempt to reach Potential +9); item-break risk starts there.
• Through Potential +5, a failed parent roll is an Ignore: no quality loss and 35% of ordinary attempted materials are returned.
• At Potential +6 and +7, a failed parent roll is a Loss: exactly 1 Potential level is lost and 15% of ordinary attempted materials are returned.
• From Potential +8 onward, the 35% failure branch splits evenly: 50% Loss and 50% vanilla Break.
• Loss always removes exactly 1 Potential level; there is no multi-level loss chain.
• Break uses Valheim's real item-destruction branch and its normal break-return behavior.
• Failed refinements still play the Forge lightning-strike feedback; its damaging projectile/AOE behaviour remains disabled.
• On a win: 80% gives +1; 20% enters the jackpot chain, capped at +5 from one attempt.
• The Forge resource/idol is always consumed.
• Existing Potential-upgraded items remain ordinary vanilla quality items.
• The Forge UI shows the live success/failure chance and, once break risk is active, the 50/50 failure split.