Bomb Direction (#2435)

Resolves #2434 

## Description:

Allows bomb direction to be inverted by pressing a hotkey - currently
"U".

**Check the issue for screenshots / videos.**

## 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:

w.o.n

---------

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

src/client/graphics/layers/NukeTrajectoryPreviewLayer.ts

@@ -3,8 +3,13 @@ import { UnitType } from "../../../core/game/Game";
 import { TileRef } from "../../../core/game/GameMap";
 import { GameView } from "../../../core/game/GameView";
 import { ParabolaPathFinder } from "../../../core/pathfinding/PathFinding";
-import { GhostStructureChangedEvent, MouseMoveEvent } from "../../InputHandler";
+import {
+  GhostStructureChangedEvent,
+  MouseMoveEvent,
+  SwapRocketDirectionEvent,
+} from "../../InputHandler";
 import { TransformHandler } from "../TransformHandler";
+import { UIState } from "../UIState";
 import { Layer } from "./Layer";
 
 /**
@@ -27,6 +32,7 @@ export class NukeTrajectoryPreviewLayer implements Layer {
     private game: GameView,
     private eventBus: EventBus,
     private transformHandler: TransformHandler,
+    private uiState: UIState,
   ) {}
 
   shouldTransform(): boolean {
@@ -50,6 +56,12 @@ export class NukeTrajectoryPreviewLayer implements Layer {
         this.cachedSpawnTile = null;
       }
     });
+    this.eventBus.on(SwapRocketDirectionEvent, () => {
+      // Toggle rocket direction
+      this.uiState.rocketDirectionUp = !this.uiState.rocketDirectionUp;
+      // Force trajectory recalculation
+      this.lastTargetTile = null;
+    });
   }
 
   tick() {
@@ -210,6 +222,7 @@ export class NukeTrajectoryPreviewLayer implements Layer {
       targetTile,
       speed,
       distanceBasedHeight,
+      this.uiState.rocketDirectionUp,
     );
 
     this.trajectoryPoints = pathFinder.allTiles();