feat(repair): support multiple required parts and per-part case anchor

- RepairMissionConfig.requiredReplacementPartId (string) is replaced by
  requiredReplacementPartIds (readonly string[]) so a mission can accept
  several alternative correct parts (e.g. pylon will accept either cable).
- RepairMissionPartConfig gains optional caseAnchor (where the standalone
  spawns inside packderelance), caseLockGroup (mutually exclusive parts),
  and targetNodeName (snap onto a node of the broken model rather than a
  placeholder slot in the case).
- RepairScannedBrokenPart gains targetNodeName so scan results can carry
  this hint through to the repairing step.
- RepairRepairingStep validation logic (placed/wrong/feedback) now matches
  any id in requiredReplacementPartIds. Existing data is migrated mechanically
  (single-element arrays); part-level new fields are wired in subsequent
  commits.

src/components/three/gameplay/RepairRepairingStep.tsx

@@ -80,8 +80,8 @@ export function RepairRepairingStep({
     useState(false);
   const replacementParts = getReplacementParts(config);
   const brokenPartsToDeposit = getBrokenPartsToDeposit(config, brokenParts);
-  const requiredReplacementPart = replacementParts.find(
+  const requiredReplacementPart = replacementParts.find((part) =>
-    (part) => part.id === config.requiredReplacementPartId,
+    config.requiredReplacementPartIds.includes(part.id),
   );
   const requiredReplacementLabel =
     requiredReplacementPart?.label ?? config.label;
@@ -89,15 +89,16 @@ export function RepairRepairingStep({
   const placeholderPositions = placeholderTargets.map(
     (target) => target.position,
   );
-  const hasCorrectPartPlaced = Boolean(
+  const hasCorrectPartPlaced = config.requiredReplacementPartIds.some(
-    placedPartIds[config.requiredReplacementPartId],
+    (id) => placedPartIds[id],
   );
   const hasDepositedBrokenParts = brokenPartsToDeposit.every(
     (part) => depositedBrokenPartIds[part.id],
   );
   const hasWrongPartPlaced = replacementParts.some(
     (part) =>
-      part.id !== config.requiredReplacementPartId && placedPartIds[part.id],
+      !config.requiredReplacementPartIds.includes(part.id) &&
+      placedPartIds[part.id],
   );
   const isReadyToInstall = hasCorrectPartPlaced && hasDepositedBrokenParts;
   const installColor = isReadyToInstall
@@ -198,7 +199,7 @@ export function RepairRepairingStep({
         const isPlaced = Boolean(placedPartIds[part.id]);
         const feedbackState = getReplacementFeedbackState(
           part.id,
-          config.requiredReplacementPartId,
+          config.requiredReplacementPartIds,
           isPlaced,
         );
 
@@ -387,12 +388,12 @@ function getPlacementFeedbackColor(
 
 function getReplacementFeedbackState(
   partId: string,
-  requiredPartId: string,
+  requiredPartIds: readonly string[],
   isPlaced: boolean,
 ): RepairPartPlacementFeedbackProps["state"] {
   if (!isPlaced) return null;
 
-  return partId === requiredPartId ? "valid" : "invalid";
+  return requiredPartIds.includes(partId) ? "valid" : "invalid";
 }
 
 function getPlaceholderTargets(
@@ -466,9 +467,12 @@ function getReplacementParts(
 ): readonly RepairMissionPartConfig[] {
   if (config.replacementParts.length > 0) return config.replacementParts;
 
+  const fallbackId =
+    config.requiredReplacementPartIds[0] ?? `${config.id}-replacement`;
+
   return [
     {
-      id: config.requiredReplacementPartId,
+      id: fallbackId,
       label: config.label,
       modelPath: config.modelPath,
     },

src/data/gameplay/repairMissions.ts

@@ -25,7 +25,7 @@ export const REPAIR_MISSIONS: Record<RepairMissionId, RepairMissionConfig> = {
     interactUiPath: REPAIR_INTERACT_UI_PATH,
     brokenUiPath: REPAIR_BROKEN_UI_PATH,
     case: DEFAULT_REPAIR_CASE,
-    requiredReplacementPartId: "ebike-cooling-core-replacement",
+    requiredReplacementPartIds: ["ebike-cooling-core-replacement"],
     brokenParts: [
       {
         id: "ebike-cooling-core",
@@ -59,7 +59,7 @@ export const REPAIR_MISSIONS: Record<RepairMissionId, RepairMissionConfig> = {
     brokenUiPath: REPAIR_BROKEN_UI_PATH,
     case: DEFAULT_REPAIR_CASE,
     reassemblySeconds: 1.8,
-    requiredReplacementPartId: "pylon-grid-relay-replacement",
+    requiredReplacementPartIds: ["pylon-grid-relay-replacement"],
     scanPartSeconds: 1.4,
     brokenParts: [
       {
@@ -104,7 +104,7 @@ export const REPAIR_MISSIONS: Record<RepairMissionId, RepairMissionConfig> = {
     brokenUiPath: REPAIR_BROKEN_UI_PATH,
     case: DEFAULT_REPAIR_CASE,
     reassemblySeconds: 1.2,
-    requiredReplacementPartId: "farm-irrigation-pump-replacement",
+    requiredReplacementPartIds: ["farm-irrigation-pump-replacement"],
     scanPartSeconds: 0.9,
     brokenParts: [
       {

src/types/gameplay/repairMission.ts

@@ -3,6 +3,7 @@ import type {
   Vector3Scale,
   Vector3Tuple,
 } from "@/types/three/three";
+import type { RepairCasePartAnchorName } from "@/data/gameplay/repairCaseConfig";
 
 export const REPAIR_MISSION_IDS = ["ebike", "pylon", "farm"] as const;
 
@@ -24,7 +25,28 @@ export interface RepairMissionPartConfig {
   id: string;
   label: string;
   nodeName?: string;
+  /**
+   * Name of a node inside the broken model where this part should snap on
+   * install. Used by replacement parts that target a slot in the broken
+   * model itself (e.g. pylon cable installs at the world-position of the
+   * pylon's `cable2` node), and by broken parts that should spawn at their
+   * original location on the broken model rather than a static offset.
+   */
+  targetNodeName?: string;
   caseSlotName?: string;
+  /**
+   * Anchor name in the packderelance case where this replacement part is
+   * visually injected. When set, the part spawns at the world-position of
+   * that anchor instead of a generic placeholder slot.
+   */
+  caseAnchor?: RepairCasePartAnchorName;
+  /**
+   * Group identifier for mutually exclusive replacement parts (e.g. pylon
+   * cables: only one cable can be held/installed at a time). When one part
+   * of the group is held, others in the same group are visually ghosted
+   * and non-interactive.
+   */
+  caseLockGroup?: string;
   modelPath?: string;
 }
 
@@ -33,6 +55,7 @@ export interface RepairScannedBrokenPart {
   label: string;
   modelPath: string;
   caseSlotName?: string;
+  targetNodeName?: string;
 }
 
 export interface RepairMissionConfig {
@@ -46,7 +69,13 @@ export interface RepairMissionConfig {
   brokenUiPath: string;
   case: RepairMissionCaseConfig;
   reassemblySeconds?: number;
-  requiredReplacementPartId: string;
+  /**
+   * Replacement part IDs accepted as the correct install. Multiple values
+   * are used when several alternatives are valid (e.g. pylon accepts either
+   * cable model). Install validation succeeds when any one of these parts
+   * is snapped into a placeholder slot.
+   */
+  requiredReplacementPartIds: readonly string[];
   scanPartSeconds?: number;
   brokenParts: readonly RepairMissionPartConfig[];
   replacementParts: readonly RepairMissionPartConfig[];