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## PR-Codex overview
This PR primarily updates various dependencies across multiple `package.json` files, particularly upgrading the `next` version from `15.3.6` to `15.3.8` and `@next/eslint-plugin-next` from `15.3.6` to `15.3.8`. It also modifies the `pnpm-lock.yaml` to reflect these updates.
### Detailed summary
- Updated `next` from `15.3.6` to `15.3.8` in:
- `packages/ui/package.json`
- `apps/wallet-ui/package.json`
- `apps/portal/package.json`
- `apps/playground-web/package.json`
- `apps/nebula/package.json`
- `apps/dashboard/package.json`
- Updated `@next/eslint-plugin-next` from `15.3.6` to `15.3.8` in:
- `apps/wallet-ui/package.json`
- `apps/nebula/package.json`
- `apps/dashboard/package.json`
- Updated `@next/mdx` from `15.3.6` to `15.3.8` in `apps/portal/package.json`.
- Adjusted `pnpm-lock.yaml` to reflect the above dependency updates.
> The following files were skipped due to too many changes: `pnpm-lock.yaml`
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<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit
* **Chores**
* Bumped Next.js and related Next packages (minor/patch updates) across multiple apps and packages for stability and consistency.
* Normalized package manifest formatting across projects; no functional or public API changes introduced.
<sub>✏️ Tip: You can customize this high-level summary in your review settings.</sub>
<!-- end of auto-generated comment: release notes by coderabbit.ai -->