chore(deps-dev): bump storybook from 8.6.14 to 8.6.15 (#1857)

Bumps
[storybook](https://github.com/storybookjs/storybook/tree/HEAD/code/core)
from 8.6.14 to 8.6.15.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/storybookjs/storybook/releases">storybook's
releases</a>.</em></p>
<blockquote>
<h2>v8.6.15</h2>
<h2>8.6.15</h2>
<ul>
<li>Core: Fix .env-file parsing, thanks <a
href="https://github.com/jreinhold"><code>@​jreinhold</code></a>!</li>
</ul>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/storybookjs/storybook/blob/next/CHANGELOG.md">storybook's
changelog</a>.</em></p>
<blockquote>
<h2>8.6.15</h2>
<ul>
<li>Core: Fix .env-file parsing, thanks <a
href="https://github.com/jreinhold"><code>@​jreinhold</code></a>!</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/storybookjs/storybook/commit/3812b43cbb4ac5fec5fb681267e2d79d32b32b48"><code>3812b43</code></a>
Bump version from 8.6.14 to 8.6.15 MANUALLY</li>
<li><a
href="https://github.com/storybookjs/storybook/commit/4a04cb29be1ecc8b0fbb3def47a7a9c319d43762"><code>4a04cb2</code></a>
filter env vars from .env files</li>
<li>See full diff in <a
href="https://github.com/storybookjs/storybook/commits/v8.6.15/code/core">compare
view</a></li>
</ul>
</details>
<br />


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<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> Upgrade Storybook to 8.6.15 and refresh the lockfile, aligning related
Storybook packages and build/test tooling.
> 
> - **Storybook**:
> - Bump `storybook` from `8.6.14` to `8.6.15` in
`packages/design-system/package.json`.
> - Update related packages to reference `8.6.15` (e.g.,
`@storybook/core`, `@storybook/theming`, addons,
`@chromatic-com/storybook`).
> - **Tooling/Dependencies (lockfile)**:
> - Update `esbuild` to `0.25.12` (with platform binaries) and
`jsdoc-type-pratt-parser` to `4.8.0` pulled by Storybook.
> - Minor bumps: `@commitlint/*` to `20.2.0`, `eslint-config-next` to
`16.1.0`, `@types/node` to `25.0.3` in several subtrees, CodeMirror view
to `6.39.4`, `lib0` to `0.2.115`, and other patch-level updates.
> - Adjust peer/metadata references across `@storybook/*`, `msw`,
`vitest` plugins to match new versions.
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
2c0db24. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

> **Note**
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Author: dependabot[bot]

packages/design-system/package.json

@@ -91,7 +91,7 @@
     "react-dom": "catalog:",
     "require-from-string": "^2.0.2",
     "rimraf": "^3.0.2",
-    "storybook": "^8.6.12",
+    "storybook": "^8.6.15",
     "tailwindcss": "catalog:",
     "tsup": "catalog:",
     "typescript": "catalog:",