chore(deps): bump next to 15.5.19 for security patches

15.5.9 was behind on patch releases. 15.5.19 clears all 18 open GitHub
advisories for next (DoS, middleware/proxy bypass, SSRF CVE-2026-44578,
XSS, cache poisoning). None were exploitable in this static export
(output: "export" has no server runtime), and the React Server
Components RCE (CVE-2025-66478) was already fixed in 15.5.7 — but staying
on the latest 15.5.x patch removes the exposure entirely.

eslint-config-next aligned to 15.5.19 to match next.

Verified: production build, eslint (121 files, 0/0), pnpm audit reports
0 next advisories.

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

Author: PatrickAlphaC

package.json

@@ -30,7 +30,7 @@
     "@walletconnect/core": "^2.23.9",
     "@walletconnect/types": "^2.23.9",
     "ethers": "^6.16.0",
-    "next": "15.5.9",
+    "next": "15.5.19",
     "react": "19.2.7",
     "react-dom": "19.2.7",
     "react-router-dom": "^7.17.0",
@@ -47,7 +47,7 @@
     "@wonderland/walletless": "^1.2.0",
     "daisyui": "^5.5.23",
     "eslint": "^9",
-    "eslint-config-next": "15.5.9",
+    "eslint-config-next": "15.5.19",
     "eslint-config-prettier": "^10.1.8",
     "playwright-core": "1.60.0",
     "prettier": "^3.8.4",