Simplify WebGL renderer integration: remove dead extension code, untangle GameView naming (#4240)

## Summary

The WebGL renderer was adapted from an external extension and carried a
lot of machinery this integration never uses (replay playback, its own
input/event system, a GL radial menu). This PR is two mechanical cleanup
passes with **no behavior change**: delete the dead code, then untangle
the `GameView` naming collision.

**78 files, +142 / −2,197.**

### Pass 1 — remove dead extension baggage

- **Replay/copy mode**: `FrameData.tileMode` was hard-coded `"live"`;
the copy branches in `frame/Upload.ts`, `UploadOptions` (never passed),
`applyFullFrame`/`applyFullTiles`/`applyDelta` on the facade and
`GPURenderer`, `HeatManager.resetForSeek`, and the seek-upload methods
on `TerritoryPass`/`TrailPass` were all unreachable. Also deletes
`types/Replay.ts`, `types/FrameSource.ts`, `types/GameUpdates.ts`,
`types/Game.ts` (imported only by the types barrel).
- **FrameEvents**: trimmed from 14 fields to the 3 actually populated
and read (`deadUnits`, `conquestEvents`, `bonusEvents`). The other 11
fed the extension's stats system and were never written or read here.
- **GL radial menu**: `RadialMenuPass`, its 4 shaders, and ~10 API
methods on facade + renderer had zero callers — the game uses the DOM/d3
radial menu in `hud/layers/RadialMenu.ts`. The pass was constructed and
drawn every frame for nothing.
- **Facade event system**: `GameViewEventMap` defined 10 event types
(`click`, `hover`, `scroll`, …) but only `contextrestored` was ever
emitted — input actually flows through `InputHandler` → EventBus →
controllers. Replaced the listener map with a single `onContextRestored`
callback and deleted `Events.ts`. Also fixed the stale header comment
claiming the facade handles user interaction.
- **Unused API surface**: removed ~20 facade/renderer methods with zero
callers (camera passthroughs like
`panTo`/`zoomTo`/`fitMap`/`screenToWorld`, hit-testing queries, SAM
replay setters, `setSelectedUnit`, `clearFx`/`setFxTimeFn`,
`onFrame`/`afterRender`/fps tracking).

Deliberately left alone: `Camera`'s pan/zoom primitives (building blocks
for a possible future camera unification) and the `timeFn` plumbing
inside the FX passes (deeply embedded as defaults; only the dead
renderer-level wrappers were removed).

### Pass 2 — untangle the three GameViews

- `render/gl/GameView.ts` → **`MapRenderer.ts`** (class `MapRenderer`).
Every importer was already aliasing it as `WebGLGameView` to dodge the
collision with the simulation-mirror `GameView` in `client/view/`, so
this removes aliasing rather than adding churn. `render/CLAUDE.md`
updated.
- Deleted the `src/core/game/GameView.ts` back-compat shim (its own TODO
asked for this). All 51 importers now import from `src/client/view/`
directly via a new 3-line barrel `view/index.ts`.

## Test plan

- `tsc --noEmit` clean, `eslint` clean
- Full test suite passes (1,385 + 65 server tests)
- Manual verification via headless Chromium: started a singleplayer game
and confirmed the renderer works end-to-end — terrain draws, spawn-phase
overlay shows, territories fill with borders after spawning, player
names/flags render, no renderer console errors

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

tests/client/graphics/RadialMenuElements.test.ts

@@ -7,9 +7,9 @@ import {
   rootMenuElement,
   Slot,
 } from "../../../src/client/hud/layers/RadialMenuElements";
+import { GameView, PlayerView } from "../../../src/client/view";
 import { UnitType } from "../../../src/core/game/Game";
 import { TileRef } from "../../../src/core/game/GameMap";
-import { GameView, PlayerView } from "../../../src/core/game/GameView";
 
 vi.mock("../../../src/client/Utils", () => ({
   translateText: vi.fn((key: string) => key),

tests/client/graphics/layers/PlayerPanelKick.test.ts

@@ -30,8 +30,8 @@ import { actionButton } from "../../../../src/client/components/ui/ActionButton"
 import { PlayerModerationModal } from "../../../../src/client/hud/layers/PlayerModerationModal";
 import { PlayerPanel } from "../../../../src/client/hud/layers/PlayerPanel";
 import { SendKickPlayerIntentEvent } from "../../../../src/client/Transport";
+import { PlayerView } from "../../../../src/client/view";
 import { PlayerType } from "../../../../src/core/game/Game";
-import { PlayerView } from "../../../../src/core/game/GameView";
 
 describe("PlayerPanel - kick player moderation", () => {
   let panel: PlayerPanel;

tests/client/view/GameView.test.ts

@@ -454,11 +454,6 @@ describe("GameView.frameData() — renderer contract", () => {
     expect(game.frameData().events.deadUnits).toBe(a1);
   });
 
-  it("frame.tileMode is 'live'", () => {
-    const game = makeGameView();
-    expect(game.frameData().tileMode).toBe("live");
-  });
-
   it("frame.structuresDirty is true on first populate (force initial upload)", () => {
     const game = makeGameView();
     game.update(makeEmptyGu(1));