BUG FIX: Gold double deduction + Rmoval of UnitType.Construction (#2378)

## Description:

- Removed the temporary UnitType.Construction and embedded construction
state into real units via isUnderConstruction().
- Centralized non-structure spawning to perform a single validation
right before unit creation/launch.
- Updated UI layers to render construction state without relying on the
removed enum.
- Adjusted and created tests to match the new flow and to cover the
no-refundscenarios.

# Tests updated 
- tests/economy/ConstructionGold.test.ts: covers structure cost
deduction and income, tolerant of passive income; ensures no refunds
during construction.
- tests/nukes/HydrogenAndMirv.test.ts: accounts for single-check launch
flow; MIRV test targets a player-owned tile; ensures launch after
payment.
- tests/client/graphics/UILayer.test.ts: mocks now provide
isUnderConstruction and real type strings;

## Please complete the following:

- [X] I have added screenshots for all UI updates
- [X] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [X] I have added relevant tests to the test directory
- [X] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced

## Please put your Discord username so you can be contacted if a bug or
regression is found:

CrackeRR1

---------

Co-authored-by: Evan <evanpelle@gmail.com>

src/client/graphics/layers/RadialMenuElements.ts

@@ -452,7 +452,7 @@ export const deleteUnitElement: MenuElement = {
       .units()
       .filter(
         (unit) =>
-          unit.constructionType() === undefined &&
+          !unit.isUnderConstruction() &&
           unit.markedForDeletion() === false &&
           params.game.manhattanDist(unit.tile(), params.tile) <=
             DELETE_SELECTION_RADIUS,

src/client/graphics/layers/StructureDrawingUtils.ts

@@ -143,19 +143,12 @@ export class SpriteFactory {
     const screenPos = this.transformHandler.worldToScreenCoordinates(worldPos);
 
     const isMarkedForDeletion = unit.markedForDeletion() !== false;
-    const isConstruction = unit.type() === UnitType.Construction;
-    const constructionType = unit.constructionType();
-    const structureType = isConstruction ? constructionType! : unit.type();
+    const isConstruction = unit.isUnderConstruction();
+    const structureType = unit.type();
     const { type, stage } = options;
     const { scale } = this.transformHandler;
 
     if (type === "icon" || type === "dot") {
-      if (isConstruction && constructionType === undefined) {
-        console.warn(
-          `Unit ${unit.id()} is a construction but has no construction type.`,
-        );
-        return parentContainer;
-      }
       const texture = this.createTexture(
         structureType,
         unit.owner(),

src/client/graphics/layers/StructureIconsLayer.ts

@@ -469,10 +469,7 @@ export class StructureIconsLayer implements Layer {
         this.checkForOwnershipChange(render, unitView);
         this.checkForLevelChange(render, unitView);
       }
-    } else if (
-      this.structures.has(unitView.type()) ||
-      unitView.type() === UnitType.Construction
-    ) {
+    } else if (this.structures.has(unitView.type())) {
       this.addNewStructure(unitView);
     }
   }
@@ -485,10 +482,7 @@ export class StructureIconsLayer implements Layer {
   }
 
   private modifyVisibility(render: StructureRenderInfo) {
-    const structureType =
-      render.unit.type() === UnitType.Construction
-        ? render.unit.constructionType()!
-        : render.unit.type();
+    const structureType = render.unit.type();
     const structureInfos = this.structures.get(structureType);
 
     let focusStructure = false;
@@ -529,10 +523,7 @@ export class StructureIconsLayer implements Layer {
     render: StructureRenderInfo,
     unit: UnitView,
   ) {
-    if (
-      render.underConstruction &&
-      render.unit.type() !== UnitType.Construction
-    ) {
+    if (render.underConstruction && !unit.isUnderConstruction()) {
       render.underConstruction = false;
       render.iconContainer?.destroy();
       render.dotContainer?.destroy();
@@ -580,10 +571,7 @@ export class StructureIconsLayer implements Layer {
         : screenPos.y,
     );
 
-    const type =
-      render.unit.type() === UnitType.Construction
-        ? render.unit.constructionType()
-        : render.unit.type();
+    const type = render.unit.type();
     const margin =
       type !== undefined && STRUCTURE_SHAPES[type] !== undefined
         ? ICON_SIZE[STRUCTURE_SHAPES[type]]
@@ -637,7 +625,7 @@ export class StructureIconsLayer implements Layer {
       this.createLevelSprite(unitView),
       this.createDotSprite(unitView),
       unitView.level(),
-      unitView.type() === UnitType.Construction,
+      unitView.isUnderConstruction(),
     );
     this.renders.push(render);
     this.computeNewLocation(render);

src/client/graphics/layers/StructureLayer.ts

@@ -190,7 +190,7 @@ export class StructureLayer implements Layer {
     )) {
       this.paintCell(
         new Cell(this.game.x(tile), this.game.y(tile)),
-        unit.type() === UnitType.Construction
+        unit.isUnderConstruction()
           ? underConstructionColor
           : unit.owner().territoryColor(),
         130,
@@ -199,7 +199,7 @@ export class StructureLayer implements Layer {
   }
 
   private handleUnitRendering(unit: UnitView) {
-    const unitType = unit.constructionType() ?? unit.type();
+    const unitType = unit.type();
     const iconType = unitType;
     if (!this.isUnitTypeSupported(unitType)) return;
 
@@ -208,7 +208,7 @@ export class StructureLayer implements Layer {
     let borderColor = unit.owner().borderColor();
 
     // Handle cooldown states and special icons
-    if (unit.type() === UnitType.Construction) {
+    if (unit.isUnderConstruction()) {
       icon = this.unitIcons.get(iconType);
       borderColor = underConstructionColor;
     } else {
@@ -247,7 +247,7 @@ export class StructureLayer implements Layer {
     unit: UnitView,
   ) {
     let color = unit.owner().borderColor();
-    if (unit.type() === UnitType.Construction) {
+    if (unit.isUnderConstruction()) {
       // eslint-disable-next-line @typescript-eslint/no-unused-vars
       color = underConstructionColor;
     }

src/client/graphics/layers/TerritoryLayer.ts

@@ -90,6 +90,11 @@ export class TerritoryLayer implements Layer {
     const unitUpdates = updates !== null ? updates[GameUpdateType.Unit] : [];
     unitUpdates.forEach((update) => {
       if (update.unitType === UnitType.DefensePost) {
+        // Only update borders if the defense post is not under construction
+        if (update.underConstruction) {
+          return; // Skip barrier creation while under construction
+        }
+
         const tile = update.pos;
         this.game
           .bfs(tile, euclDistFN(tile, this.game.config().defensePostRange()))

src/client/graphics/layers/UILayer.ts

@@ -103,16 +103,12 @@ export class UILayer implements Layer {
   }
 
   onUnitEvent(unit: UnitView) {
+    const underConst = unit.isUnderConstruction();
+    if (underConst) {
+      this.createLoadingBar(unit);
+      return;
+    }
     switch (unit.type()) {
-      case UnitType.Construction: {
-        const constructionType = unit.constructionType();
-        if (constructionType === undefined) {
-          // Skip units without construction type
-          return;
-        }
-        this.createLoadingBar(unit);
-        break;
-      }
       case UnitType.Warship: {
         this.drawHealthBar(unit);
         break;
@@ -318,22 +314,20 @@ export class UILayer implements Layer {
     if (!unit.isActive()) {
       return 1;
     }
-    switch (unit.type()) {
-      case UnitType.Construction: {
-        const constructionType = unit.constructionType();
-        if (constructionType === undefined) {
-          return 1;
-        }
-        const constDuration =
-          this.game.unitInfo(constructionType).constructionDuration;
-        if (constDuration === undefined) {
-          throw new Error("unit does not have constructionTime");
-        }
-        return (
-          (this.game.ticks() - unit.createdAt()) /
-          (constDuration === 0 ? 1 : constDuration)
-        );
+    const underConst = unit.isUnderConstruction();
+    if (underConst) {
+      const constDuration = this.game.unitInfo(
+        unit.type(),
+      ).constructionDuration;
+      if (constDuration === undefined) {
+        throw new Error("unit does not have constructionTime");
       }
+      return (
+        (this.game.ticks() - unit.createdAt()) /
+        (constDuration === 0 ? 1 : constDuration)
+      );
+    }
+    switch (unit.type()) {
       case UnitType.MissileSilo:
       case UnitType.SAMLauncher:
         return !unit.markedForDeletion()