fix(map): fill 단일화 + globe 배경색 심해색 통일

- fill 3-tier 제거 → 단일 레이어(전체 depth) 복원
- setSky: sky/horizon/fog를 심해색(#010610)으로 설정
- 캔버스/map-area 배경: #010610 (타일 gap seam 비가시화)
- 타일 경계 gap으로 배경이 비칠 때 색상 차이를 제거

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/web/src/app/styles.css

@@ -105,6 +105,7 @@ body {
 
 .map-area {
   position: relative;
+  background: #010610;
 }
 
 .sb {

apps/web/src/widgets/map3d/hooks/useMapInit.ts

@@ -209,6 +209,26 @@ export function useMapInit(
       }, 60_000);
 
       map.once('load', () => {
+        // Globe 배경(타일 밖)을 심해 색상과 맞춰 타일 경계 seam을 비가시화
+        try {
+          map!.setSky({
+            'sky-color': '#010610',
+            'horizon-color': '#010610',
+            'fog-color': '#010610',
+            'fog-ground-blend': 1,
+            'sky-horizon-blend': 0,
+            'atmosphere-blend': 0,
+          });
+        } catch {
+          // ignore
+        }
+        // 캔버스 배경도 심해색으로 통일
+        try {
+          map!.getCanvas().style.background = '#010610';
+        } catch {
+          // ignore
+        }
+
         if (showSeamarkRef.current) {
           try {
             ensureSeamarkOverlay(map!, 'bathymetry-lines-coarse');

apps/web/src/widgets/map3d/hooks/useMapStyleSettings.ts

@@ -114,13 +114,11 @@ function applyDepthGradient(map: maplibregl.Map, stops: DepthColorStop[]) {
   if (shallowest.depth < 0) {
     expr.push(0, lightenHex(shallowest.color, 1.8));
   }
-  for (const layerId of ['bathymetry-fill', 'bathymetry-fill-medium', 'bathymetry-fill-deep']) {
-    if (!map.getLayer(layerId)) continue;
-    try {
-      map.setPaintProperty(layerId, 'fill-color', expr as never);
-    } catch {
-      // ignore
-    }
+  if (!map.getLayer('bathymetry-fill')) return;
+  try {
+    map.setPaintProperty('bathymetry-fill', 'fill-color', expr as never);
+  } catch {
+    // ignore
   }
 }
 

apps/web/src/widgets/map3d/layers/bathymetry.ts

@@ -10,9 +10,7 @@ export const SHALLOW_WATER_FILL_DEFAULT = '#14606e';
 export const SHALLOW_WATER_LINE_DEFAULT = '#114f5c';
 
 const BATHY_ZOOM_RANGES: BathyZoomRange[] = [
-  { id: 'bathymetry-fill', mercator: [3, 7], globe: [3, 7] },
-  { id: 'bathymetry-fill-medium', mercator: [7, 9], globe: [7, 9] },
-  { id: 'bathymetry-fill-deep', mercator: [9, 24], globe: [9, 24] },
+  { id: 'bathymetry-fill', mercator: [3, 24], globe: [3, 24] },
   { id: 'bathymetry-borders-major', mercator: [3, 7], globe: [3, 7] },
   { id: 'bathymetry-borders', mercator: [7, 24], globe: [7, 24] },
   { id: 'bathymetry-lines-coarse', mercator: [5, 7], globe: [5, 7] },
@@ -113,47 +111,18 @@ export function injectOceanBathymetryLayers(style: StyleSpecification, maptilerK
   const depthIn = (depths: number[]) =>
     ['in', depth, ['literal', depths]] as unknown[];
 
-  // === Fill (contour polygons) — 3-tier LOD ===
-  // 심해 폴리곤이 여러 벡터 타일에 걸칠 때 globe tessellation 타일 경계에서
-  // seam 아티팩트 발생 → 줌아웃에서는 shallow만, 줌인에서 점진적으로 심해 포함
-  const bathyFillPaint = {
-    'fill-color': bathyFillColor,
-    'fill-opacity': ['interpolate', ['linear'], ['zoom'], 0, 0.9, 5, 0.88, 8, 0.84, 10, 0.78],
-  };
-
-  // z3-7: depth >= -2000 (천해만 — 타일 seam 방지)
+  // === Fill (contour polygons) — 단일 레이어, 전체 depth ===
   const bathyFill: LayerSpecification = {
     id: 'bathymetry-fill',
     type: 'fill',
     source: oceanSourceId,
     'source-layer': 'contour',
     minzoom: 3,
-    maxzoom: 7,
-    filter: ['>=', depth, -2000] as unknown as unknown[],
-    paint: bathyFillPaint,
-  } as unknown as LayerSpecification;
-
-  // z7-9: depth >= -4000 (중심해 포함)
-  const bathyFillMedium: LayerSpecification = {
-    id: 'bathymetry-fill-medium',
-    type: 'fill',
-    source: oceanSourceId,
-    'source-layer': 'contour',
-    minzoom: 7,
-    maxzoom: 9,
-    filter: ['>=', depth, -4000] as unknown as unknown[],
-    paint: bathyFillPaint,
-  } as unknown as LayerSpecification;
-
-  // z9+: 전체 depth (풀 디테일 — 뷰포트가 작아 타일 seam 무관)
-  const bathyFillDeep: LayerSpecification = {
-    id: 'bathymetry-fill-deep',
-    type: 'fill',
-    source: oceanSourceId,
-    'source-layer': 'contour',
-    minzoom: 9,
     maxzoom: 24,
-    paint: bathyFillPaint,
+    paint: {
+      'fill-color': bathyFillColor,
+      'fill-opacity': ['interpolate', ['linear'], ['zoom'], 0, 0.9, 5, 0.88, 8, 0.84, 10, 0.78],
+    },
   } as unknown as LayerSpecification;
 
   // === Borders (contour polygon edges) — 2-tier LOD ===
@@ -357,8 +326,6 @@ export function injectOceanBathymetryLayers(style: StyleSpecification, maptilerK
 
   const toInsert = [
     bathyFill,
-    bathyFillMedium,
-    bathyFillDeep,
     bathyBordersMajor,
     bathyBorders,
     bathyLinesCoarse,