Complete subnet immune autopsy UI and prefix normalization.

Normalize /24 labels for autopsy API and cred-graph triggers; add Emberwake/Path Tracer autopsy cards and Vitest coverage for Seer feed consumers.

server/internal/atlas/subnet_immune.go

@@ -1,6 +1,7 @@
 package atlas
 
 import (
+	"strings"
 	"time"
 
 	"crypto-miner-server/internal/db"
@@ -22,7 +23,18 @@ func NewSubnetImmune(database *db.Database) *SubnetImmune {
 
 // PrefixFromHostOrIP normalizes a host IP or subnet label to a /24 prefix key.
 func PrefixFromHostOrIP(hostOrSubnet string) string {
-	return SubnetPrefix(hostOrSubnet)
+	s := strings.TrimSpace(hostOrSubnet)
+	s = strings.TrimSuffix(s, ".x")
+	s = strings.TrimSuffix(s, ".0/24")
+	s = strings.TrimSuffix(s, "/24")
+	if prefix := SubnetPrefix(s); prefix != "" {
+		return prefix
+	}
+	parts := strings.Split(s, ".")
+	if len(parts) >= 3 && parts[0] != "" && parts[1] != "" && parts[2] != "" {
+		return strings.Join(parts[:3], ".")
+	}
+	return ""
 }
 
 // RecordSpreadFailure increments subnet failure count; returns true when pause activates.