chore(phase0): deepfield 파티클 잔재 3파일 + three/@types/three 의존성 제거

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

lib/__tests__/deepfield-mode.test.ts

@@ -1,26 +0,0 @@
-import { describe, it, expect } from 'vitest';
-import { decideFieldMode } from '@/lib/deepfield-mode';
-
-const base = { reducedMotion: false, webglSupported: true, hardwareConcurrency: 8, viewportWidth: 1440 };
-
-describe('decideFieldMode', () => {
-  it('데스크톱 + WebGL = full', () => {
-    expect(decideFieldMode(base)).toBe('full');
-  });
-  it('reduced-motion이면 무조건 static', () => {
-    expect(decideFieldMode({ ...base, reducedMotion: true })).toBe('static');
-    expect(decideFieldMode({ ...base, reducedMotion: true, viewportWidth: 375 })).toBe('static');
-  });
-  it('WebGL 미지원이면 static', () => {
-    expect(decideFieldMode({ ...base, webglSupported: false })).toBe('static');
-  });
-  it('모바일 뷰포트(<768)는 lite', () => {
-    expect(decideFieldMode({ ...base, viewportWidth: 767 })).toBe('lite');
-  });
-  it('저성능 코어(<4)는 lite', () => {
-    expect(decideFieldMode({ ...base, hardwareConcurrency: 2 })).toBe('lite');
-  });
-  it('hardwareConcurrency 미보고(0/undefined)는 lite로 보수적 판정', () => {
-    expect(decideFieldMode({ ...base, hardwareConcurrency: 0 })).toBe('lite');
-  });
-});

lib/deepfield-mode.ts

@@ -1,17 +0,0 @@
-export type FieldMode = 'full' | 'lite' | 'static';
-
-export interface FieldEnv {
-  reducedMotion: boolean;
-  webglSupported: boolean;
-  hardwareConcurrency: number; // 미보고 시 0
-  viewportWidth: number;
-}
-
-/** Deep Field 렌더 모드 판정 — 우선순위: 접근성 > 지원 여부 > 성능 */
-export function decideFieldMode(env: FieldEnv): FieldMode {
-  if (env.reducedMotion) return 'static';
-  if (!env.webglSupported) return 'static';
-  if (env.viewportWidth < 768) return 'lite';
-  if (!env.hardwareConcurrency || env.hardwareConcurrency < 4) return 'lite';
-  return 'full';
-}