fix(web): pin Next SWC binaries and regenerate lockfile with CI's npm

Since the SDK 56 dependency churn, arborist nests next under apps/web and
npm 10 skipped its platform-optional SWC binaries on the x64 CI runner,
breaking next build. Pin the linux and darwin binaries as direct
optionalDependencies of @sauci/web (bump alongside next) and regenerate
the lockfile from scratch with npm 10.8.2 to match CI. Verified in a
linux/amd64 node:20.19.4 container: npm ci installs the binary.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

apps/web/package.json

@@ -1,32 +1,37 @@
-{
-  "name": "@sauci/web",
-  "version": "1.0.0",
-  "private": true,
-  "scripts": {
-    "dev": "next dev",
-    "build": "next build",
+{
+  "name": "@sauci/web",
+  "version": "1.0.0",
+  "private": true,
+  "scripts": {
+    "dev": "next dev",
+    "build": "next build",
     "start": "next start",
     "lint": "eslint .",
     "test": "vitest run --passWithNoTests",
     "typecheck": "tsc --noEmit"
-  },
-  "dependencies": {
-    "framer-motion": "^11.0.0",
-    "lucide-react": "^0.460.0",
-    "next": "15.5.24",
-    "posthog-js": "^1.311.0",
-    "react": "^18.3.1",
-    "react-dom": "^18.3.1"
-  },
-  "devDependencies": {
-    "@types/node": "^20.0.0",
+  },
+  "dependencies": {
+    "framer-motion": "^11.0.0",
+    "lucide-react": "^0.460.0",
+    "next": "15.5.24",
+    "posthog-js": "^1.311.0",
+    "react": "^18.3.1",
+    "react-dom": "^18.3.1"
+  },
+  "devDependencies": {
+    "@types/node": "^20.0.0",
     "@types/react": "~19.1.10",
     "@types/react-dom": "~19.1.7",
     "autoprefixer": "^10.4.0",
     "eslint": "^8.57.1",
     "eslint-config-next": "15.5.24",
     "postcss": "^8.4.0",
-    "tailwindcss": "^3.4.0",
-    "typescript": "^5.3.0"
-  }
-}
+    "tailwindcss": "^3.4.0",
+    "typescript": "^5.3.0"
+  },
+  "optionalDependencies": {
+    "@next/swc-linux-x64-gnu": "15.5.24",
+    "@next/swc-linux-x64-musl": "15.5.24",
+    "@next/swc-darwin-arm64": "15.5.24"
+  }
+}