Fix security dependency alerts

[KaladinX]

Summary

• Update Next.js and eslint-config-next to 16.2.6 to address open Dependabot alerts.
• Resolve vulnerable transitive ajv and postcss versions with targeted pnpm overrides.
• Refresh pnpm-lock.yaml after the dependency updates.

Test plan

• pnpm audit --json | jq '{metadata: .metadata.vulnerabilities, advisories: (.advisories | length), modules: (.advisories | to_entries | map(.value.module_name) | unique)}'
• pnpm build
• git diff --check

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