Wire view-mode toggles (alt-view + coordinate grid) via new ViewModeController

Moves the AlternateViewEvent / ToggleCoordinateGridEvent subscriptions out of
ClientGameRunner into a dedicated controller in src/client/controllers/. Also
wires ToggleCoordinateGridEvent (M keybind) — previously emitted with no
listener — so the persistent coordinate-grid toggle works. Grid + alt-view
hide names only under alt-view; M keeps names visible.

src/client/ClientGameRunner.ts

@@ -37,7 +37,6 @@ import {
 import { WorkerClient } from "../core/worker/WorkerClient";
 import { getPersistentID } from "./Auth";
 import {
-  AlternateViewEvent,
   AutoUpgradeEvent,
   DoBoatAttackEvent,
   DoBreakAllianceEvent,
@@ -473,11 +472,6 @@ async function createClientGame(
       (e) => applyDayNightMode((e as CustomEvent<string>).detail === "true"),
     );
 
-    // Space-hold (and the settings-modal toggle) drives the affiliation
-    // recolor. InputHandler emits AlternateViewEvent; the WebGL view needs
-    // setAltView called to switch passes into alt mode.
-    eventBus.on(AlternateViewEvent, (e) => view.setAltView(e.alternateView));
-
     view.setShowPatterns(userSettings.territoryPatterns());
     globalThis.addEventListener(
       `${USER_SETTINGS_CHANGED_EVENT}:settings.territoryPatterns`,