Release: Add 10.5.9 changelog on next

[ndelangen]

What I did

Copy the 10.5.9 changelog section onto next after the patch publish. This is the step the Publish workflow runs as Sync CHANGELOG.md from main to next.

Checklist for Contributors

Testing

The changes in this PR are covered in the following automated tests:

• stories
• unit tests
• integration tests
• end-to-end tests

Manual testing

No manual test. Changelog-only; CHANGELOG.md on next was identical to main except for the missing 10.5.9 section.

Documentation

• Add or update documentation reflecting your changes
• If you are deprecating/removing a feature, make sure to update
  MIGRATION.MD

Checklist for Maintainers

• When this PR is ready for testing, make sure to add ci:normal, ci:merged or ci:daily GH label to it to run a specific set of sandboxes. The particular set of sandboxes can be found in code/lib/cli-storybook/src/sandbox-templates.ts
• Declare whether manual QA will be needed for this PR during the next release, through qa:needed or qa:skip
• Make sure this PR contains one of the labels below:

🦋 Canary release

This PR does not have a canary release associated. You can request a canary release of this pull request by mentioning the @storybookjs/core team here.

core team members can create a canary release here or locally with gh workflow run --repo storybookjs/storybook publish.yml --field pr=<PR_NUMBER>

[Copilot]

Copilot was unable to review this pull request because the user who requested the review has reached their quota limit.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: e31b363d-b497-4506-a73c-c81097ab9e41

📥 Commits

Reviewing files that changed from the base of the PR and between b8cc04e and 16d408d.

📒 Files selected for processing (1)

• CHANGELOG.md

Included review availability: 2 reviews are currently available. Based on recent review activity, included reviews refill at 4 per hour.

---

Walkthrough

Changes

Storybook 10.5.9 release

Layer / File(s)	Summary
Release notes CHANGELOG.md	Adds the 10.5.9 release heading and eight entries covering selector rewriting, module graphs, preview initialization, stylesheet rewrites, TanStack routing and links, and Webpack preview filenames.

Merge Risk: ⚪ Minimal · up to 16d40

This is a localized changelog-only update with no actionable merge-blocking risk remaining after normal checks and review.

---

_{Comment @coderabbitai help to get the list of available commands.}