[f9ab9c9d] Supersede external PR #343: finish + harden it ourselves (#354)

* chore(deps): bump next from 16.1.1 to 16.2.6 in /panel

Bumps [next](https://github.com/vercel/next.js) from 16.1.1 to 16.2.6.
- [Release notes](https://github.com/vercel/next.js/releases)
- [Commits](https://github.com/vercel/next.js/compare/v16.1.1...v16.2.6)

---
updated-dependencies:
- dependency-name: next
  dependency-version: 16.2.6
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

* [bd79402c] Verify and harden panel/ on Next.js 16.2.6 (#350) (#353)

* [bd79402c] chore(panel): align eslint-config-next to 16.2.6 with next

* [bd79402c] docs(panel): add UPGRADE guide and dependency alignment note

Documented the Next.js 16.2.6 dependency bump and version-alignment requirement for eslint-config-next. Added UPGRADE.md with procedures for future Next.js bumps and troubleshooting, and updated README.md with a dependency management section pointing to the guide.

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Co-authored-by: Frontend Developer 1 <fe-dev-1@roboco.tech>
Co-authored-by: Frontend Documenter <fe-doc@roboco.tech>

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Frontend Developer 1 <fe-dev-1@roboco.tech>
Co-authored-by: Frontend Documenter <fe-doc@roboco.tech>

panel/package.json

@@ -42,7 +42,7 @@
     "clsx": "^2.1.1",
     "date-fns": "^4.1.0",
     "lucide-react": "^0.562.0",
-    "next": "16.1.1",
+    "next": "16.2.6",
     "next-themes": "^0.4.6",
     "react": "19.2.3",
     "react-dom": "19.2.3",
@@ -66,7 +66,7 @@
     "@types/react-dom": "^19",
     "@vitest/coverage-v8": "^4.1.9",
     "eslint": "^9",
-    "eslint-config-next": "16.1.1",
+    "eslint-config-next": "16.2.6",
     "jsdom": "^29.1.1",
     "prettier": "^3.8.5",
     "tailwindcss": "^4",