deps: bump the development group across 1 directory with 8 updates (#11428)

Validated in a combined dependabot worktree off release/v3.8.51 tip alongside #11426 and #11440 — a fresh npm install of all three combined (2437 packages, 0 vulnerabilities) plus full-suite validation:
- typecheck:core, file-size, changelog-integrity, complexity, cognitive-complexity, check:cycles — all OK, including through the @types/node 22→26 major jump
- npm run lint — 0 errors (after also draining an unrelated stale-suppressions cascade, see #11596)
- npm run test:vitest — 451/452 pass; the 1 failure (auto/glm materialization) is a pre-existing timing-flaky test, reproduced 11/11 pass ×3 in isolation, unrelated to this bump
- Node runtime unaffected — v24.16.0 unchanged, only the type definitions moved

8 development-group updates. The bun 1.3.14→1.4.0 + @types/bun bump aligns with the Bun-native infrastructure work merged earlier today (#11468/#11470/#11471/#11482), which was built against Bun 1.4+ assumptions.

package.json

@@ -371,18 +371,18 @@
     "@types/react-dom": "^19.2.4",
     "@types/safe-regex": "^1.1.6",
     "@types/ws": "^8.18.0",
-    "@vitejs/plugin-react": "^6.0.5",
-    "bun": "1.3.14",
+    "@vitejs/plugin-react": "^6.1.0",
+    "bun": "1.4.0",
     "c8": "^12.0.0",
     "concurrently": "^10.0.5",
     "cross-env": "^10.1.0",
     "ctrf": "^0.3.0",
     "dpdm": "^4.3.0",
     "eslint": "^9.39.4",
-    "eslint-config-next": "16.3.1",
+    "eslint-config-next": "16.3.2",
     "eslint-plugin-sonarjs": "^4.1.0",
     "fast-check": "^4.8.0",
-    "fumadocs-mdx": "^15.2.3",
+    "fumadocs-mdx": "^15.3.1",
     "glob": "^13.0.6",
     "httpyac": "^6.16.7",
     "husky": "^9.1.7",
@@ -394,7 +394,7 @@
     "lint-staged": "^17.3.0",
     "lockfile-lint": "^5.0.1",
     "node-loader": "^2.1.0",
-    "opencode-ai": "1.18.18",
+    "opencode-ai": "1.18.21",
     "playwright-ctrf-json-reporter": "^0.0.29",
     "prettier": "^3.9.6",
     "promptfoo": "^0.122.0",
@@ -403,7 +403,7 @@
     "type-coverage": "^2.30.1",
     "typescript": "^6.0.3",
     "typescript-eslint": "^8.67.0",
-    "vitest": "^4.1.7",
+    "vitest": "^4.1.11",
     "wait-on": "^9.1.0",
     "wtfnode": "^0.10.1"
   },