chore: add announcements for 6.4.9

docs/release-notes/6.4.9/announcements/slack.md

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+Hello @channel! :wave:
+
+Webiny 6.4.9 is out! :rocket:
+
+This release focuses on squashing some annoying bugs that were getting in the way. Bulk actions for publishing and moving entries now actually work as expected, and scheduled publish/unpublish operations behave correctly across all tenants — not just the root one.
+
+We've also polished the editing experience. The file picker in narrow sidebars (like Website Builder's style panel) now displays properly instead of cramming everything into an unreadable mess. And those "null" strings that were sneaking into select and radio fields? Gone.
+
+On the infrastructure side, we've updated the Sharp image library to v0.35.3 with Node.js 24.x support, and patched some security vulnerabilities in the deployment tooling. Check out the changelog to learn more.
+
+—
+
+As usual, the release notes can be found on the following links:point_down::skin-tone-2::
+Changelog: https://www.webiny.com/docs/release-notes/6.4.9/changelog
+How To Upgrade: https://www.webiny.com/docs/release-notes/6.4.9/upgrade-guide
+
+—
+
+Onwards and upwards — more good stuff coming your way soon! :rocket:

docs/release-notes/6.4.9/announcements/social.md

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+Webiny 6.4.9 is here 🚀
+
+Highlights:
+→ Bulk actions fixed — Publish and Move to Folder now correctly process all selected entries
+→ Multi-tenant scheduling — Scheduled publish/unpublish actions work reliably across all tenants
+→ File picker layout — Improved preview in narrow panels with better name truncation and stacked layout
+→ Folder deletion safety — Non-empty folders now block deletion instead of orphaning content
+→ Select field fix — No more "null" strings appearing when no default value is set
+
+As always, full details in the release notes 👇
+
+Changelog: https://www.webiny.com/docs/release-notes/6.4.9/changelog
+Upgrade guide: https://www.webiny.com/docs/release-notes/6.4.9/upgrade-guide

docs/release-notes/6.4.9/announcements/tweets.md

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+🛠️ Bulk publish and move-to-folder actions in Headless CMS were silently completing without actually processing any entries. Turns out the version suffix was getting stripped from entry IDs. Fixed in 6.4.9 — bulk actions now work as expected.
+
+https://www.webiny.com/docs/release-notes/6.4.9/changelog
+
+---
+
+Scheduled publish and unpublish were failing on non-root tenants — the scheduler wasn't resolving tenant context correctly. Now fixed, with RuntimeTenant serving as the authority for all CMS storage operations.
+
+https://www.webiny.com/docs/release-notes/6.4.9/changelog
+
+---
+
+Ever deleted a folder in Website Builder only to have its pages vanish from the UI but remain in the database? That silent failure is now an explicit error — folder deletion checks for contained items first.
+
+https://www.webiny.com/docs/release-notes/6.4.9/changelog
+
+---
+
+Small detail that matters: the file picker in narrow sidebars was practically unusable. Now it stacks gracefully, truncates filenames in the middle to preserve those distinguishing suffixes, and swaps tiny icons for readable text labels.
+
+https://www.webiny.com/docs/release-notes/6.4.9/changelog