fix: declare unlisted dependencies surfaced by knip

sharp (icon script), @auth/core (adapter types in _core/schema),
react-resizable (css imported by dashboard-editor), and server-only
were imported but undeclared, resolving only via pnpm hoisting.

package.json

@@ -67,12 +67,14 @@
     "pino-pretty": "^13.1.3",
     "prettier": "^3.3.3",
     "release-it": "^20.2.0",
+    "sharp": "^0.34.5",
     "tailwindcss": "^4.2.4",
     "tsx": "^4.19.4",
     "typescript": "^5.6.3",
     "typescript-eslint": "^8.15.0"
   },
   "dependencies": {
+    "@auth/core": "0.41.2",
     "@auth/drizzle-adapter": "^1.11.2",
     "@base-ui/react": "^1.4.1",
     "@fullcalendar/core": "^6.1.20",
@@ -95,6 +97,8 @@
     "react": "^19.2.5",
     "react-dom": "^19.2.5",
     "react-grid-layout": "^2.2.3",
+    "react-resizable": "^3.1.3",
+    "server-only": "^0.0.1",
     "shadcn": "^4.7.0",
     "tailwind-merge": "^3.5.0",
     "tw-animate-css": "^1.4.0",