Add new icon shapes and filter for filtering icons on the layer (#1348)

## Description:

Add triangle shape for missile silos, square for sam, octagon for
defense posts, and add a filter in the topbar to highlight structures


![image](https://github.com/user-attachments/assets/d0986037-d4d7-41c6-b353-2a69b1eeb7c4)

![highlight](https://github.com/user-attachments/assets/0018e68a-31d4-478f-be57-56c3f71ee32a)


## 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
- [x] I understand that submitting code with bugs that could have been
caught through manual testing blocks releases and new features for all
contributors

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

Vivacious Box

src/client/InputHandler.ts

@@ -1,4 +1,5 @@
 import { EventBus, GameEvent } from "../core/EventBus";
+import { UnitType } from "../core/game/Game";
 import { UnitView } from "../core/game/GameView";
 import { UserSettings } from "../core/game/UserSettings";
 import { ReplaySpeedMultiplier } from "./utilities/ReplaySpeedMultiplier";
@@ -64,6 +65,10 @@ export class CloseViewEvent implements GameEvent {}
 
 export class RefreshGraphicsEvent implements GameEvent {}
 
+export class ToggleStructureEvent implements GameEvent {
+  constructor(public readonly structureType: UnitType | null) {}
+}
+
 export class ShowBuildMenuEvent implements GameEvent {
   constructor(
     public readonly x: number,