fix(decisions): fix CK3 1.18 syntax errors in decisions

- Convert picture fields from string to block format
- Use vanilla trait names (ambitious, sadistic, greedy, callous,
  compassionate) instead of trait_ prefixed versions
- Move stress from cost block to add_stress in effect block
- Fix add_opinion: add required target field, remove redundant
  opinion value

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

lords_of_ash/common/decisions/00_mistborn_decisions.txt

@@ -54,7 +54,7 @@ host_a_ball_decision = {
 
 # Subject Heir to Snapping - force a traumatic event to awaken Allomantic potential
 subject_heir_to_snapping_decision = {
-	picture = "gfx/interface/illustrations/decisions/decision_personal_religious.dds"
+	picture = { reference = "gfx/interface/illustrations/decisions/decision_personal_religious.dds" }
 
 	desc = subject_heir_to_snapping_decision_desc
 	selection_tooltip = subject_heir_to_snapping_decision_tooltip
@@ -91,12 +91,12 @@ subject_heir_to_snapping_decision = {
 
 	cost = {
 		gold = 50
-		stress = 100
 	}
 
 	cooldown = { years = 1 }
 
 	effect = {
+		add_stress = 100
 		add_character_flag = {
 			flag = recently_attempted_snapping
 			years = 1
@@ -131,7 +131,7 @@ subject_heir_to_snapping_decision = {
 
 # Breed for Allomancy - focus bloodline efforts on strengthening Allomantic traits
 breed_for_allomancy_decision = {
-	picture = "gfx/interface/illustrations/decisions/decision_dynasty_house.dds"
+	picture = { reference = "gfx/interface/illustrations/decisions/decision_dynasty_house.dds" }
 
 	desc = breed_for_allomancy_decision_desc
 	selection_tooltip = breed_for_allomancy_decision_tooltip
@@ -199,7 +199,7 @@ breed_for_allomancy_decision = {
 
 # Hire a Kandra - engage one of the shapeshifting immortals for espionage
 hire_kandra_decision = {
-	picture = "gfx/interface/illustrations/decisions/decision_skulduggery.dds"
+	picture = { reference = "gfx/interface/illustrations/decisions/decision_skulduggery.dds" }
 
 	desc = hire_kandra_decision_desc
 	selection_tooltip = hire_kandra_decision_tooltip
@@ -254,7 +254,7 @@ hire_kandra_decision = {
 
 # Commission a Hemalurgic Spike - the dark art of stealing Allomantic power
 commission_hemalurgic_spike_decision = {
-	picture = "gfx/interface/illustrations/decisions/decision_execution.dds"
+	picture = { reference = "gfx/interface/illustrations/decisions/decision_execution.dds" }
 
 	desc = commission_hemalurgic_spike_decision_desc
 	selection_tooltip = commission_hemalurgic_spike_decision_tooltip
@@ -319,18 +319,18 @@ commission_hemalurgic_spike_decision = {
 		base = 5
 		modifier = {
 			factor = 3
-			has_trait = trait_ambitious
+			has_trait = ambitious
 		}
 		modifier = {
 			factor = 2
-			has_trait = trait_sadistic
+			has_trait = sadistic
 		}
 	}
 }
 
 # Smuggle Atium - acquire the most precious metal in the Final Empire
 smuggle_atium_decision = {
-	picture = "gfx/interface/illustrations/decisions/decision_skulduggery.dds"
+	picture = { reference = "gfx/interface/illustrations/decisions/decision_skulduggery.dds" }
 
 	desc = smuggle_atium_decision_desc
 	selection_tooltip = smuggle_atium_decision_tooltip
@@ -399,7 +399,7 @@ smuggle_atium_decision = {
 		base = 20
 		modifier = {
 			factor = 2
-			has_trait = trait_greedy
+			has_trait = greedy
 		}
 		modifier = {
 			factor = 0
@@ -410,7 +410,7 @@ smuggle_atium_decision = {
 
 # Crack Down on Skaa - suppress the skaa population through force
 crack_down_on_skaa_decision = {
-	picture = "gfx/interface/illustrations/decisions/decision_realm.dds"
+	picture = { reference = "gfx/interface/illustrations/decisions/decision_realm.dds" }
 
 	desc = crack_down_on_skaa_decision_desc
 	selection_tooltip = crack_down_on_skaa_decision_tooltip
@@ -466,18 +466,18 @@ crack_down_on_skaa_decision = {
 		base = 30
 		modifier = {
 			factor = 2
-			has_trait = trait_cruel
+			has_trait = callous
 		}
 		modifier = {
 			factor = 0.5
-			has_trait = trait_compassionate
+			has_trait = compassionate
 		}
 	}
 }
 
 # Improve Skaa Conditions - a risky act of compassion
 improve_skaa_conditions_decision = {
-	picture = "gfx/interface/illustrations/decisions/decision_misc.dds"
+	picture = { reference = "gfx/interface/illustrations/decisions/decision_misc.dds" }
 
 	desc = improve_skaa_conditions_decision_desc
 	selection_tooltip = improve_skaa_conditions_decision_tooltip
@@ -528,33 +528,33 @@ improve_skaa_conditions_decision = {
 		# Other nobles disapprove
 		every_vassal = {
 			add_opinion = {
+				target = root
 				modifier = disapproves_skaa_mercy
-				opinion = -15
 			}
 		}
 		trigger_event = mistborn_skaa.0010
 	}
 
 	ai_potential = {
-		has_trait = trait_compassionate
+		has_trait = compassionate
 	}
 
 	ai_will_do = {
 		base = 10
 		modifier = {
 			factor = 3
-			has_trait = trait_compassionate
+			has_trait = compassionate
 		}
 		modifier = {
 			factor = 0
-			has_trait = trait_cruel
+			has_trait = callous
 		}
 	}
 }
 
 # Recruit a Skaa Allomancer - secretly bring a skaa with powers into your service
 recruit_skaa_allomancer_decision = {
-	picture = "gfx/interface/illustrations/decisions/decision_skulduggery.dds"
+	picture = { reference = "gfx/interface/illustrations/decisions/decision_skulduggery.dds" }
 
 	desc = recruit_skaa_allomancer_decision_desc
 	selection_tooltip = recruit_skaa_allomancer_decision_tooltip