chore: add announcements for 6.4.7

docs/release-notes/6.4.7/announcements/slack.md

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+Hello @channel! :wave:
+
+Webiny 6.4.7 is out! :rocket:
+
+A quick maintenance release to smooth out a few rough edges! We've fixed some quirks in the Headless CMS — the scheduler now handles missing AWS events gracefully, and drag-and-drop folder moves properly wait for your confirmation before updating the UI.
+
+We also tidied up the Dynamic Zone template editing experience and fixed a layout issue where long content model names were causing sidebar overflow chaos. Small fixes, but they add up to a nicer day-to-day experience. 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/6.4.7/changelog
+How To Upgrade: https://www.webiny.com/docs/release-notes/6.4.7/upgrade-guide
+—
+
+Back to building cool stuff — hope you have a great week! :tada:

docs/release-notes/6.4.7/announcements/social.md

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+Webiny 6.4.7 is now live 🚀
+
+Highlights:
+→ Scheduler resilience — updates no longer fail when AWS events are missing
+→ Folder drag-and-drop — visual updates now wait for confirmation before moving
+→ Dynamic Zone templates — edit dialog works correctly from collapsed state
+→ Sidebar overflow fix — long content model names no longer break navigation
+
+As always, full details in the release notes 👇
+
+Changelog: https://www.webiny.com/docs/release-notes/6.4.7/changelog
+Upgrade guide: https://www.webiny.com/docs/release-notes/6.4.7/upgrade-guide

docs/release-notes/6.4.7/announcements/tweets.md

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+Drag-and-drop folder moves in Webiny used to show the folder jumping to its new spot before you'd even confirmed the action. Now the visual update waits for your confirmation — cancel and it stays put. Much less jarring.
+
+https://www.webiny.com/docs/release-notes/6.4.7/changelog
+
+---
+
+Ever had a scheduled publish fail because someone deleted the underlying AWS event? Webiny's scheduler now handles this gracefully — if the EventBridge event is missing, it creates a new one instead of erroring out.
+
+https://www.webiny.com/docs/release-notes/6.4.7/changelog
+
+---
+
+Dynamic Zone template editing just got less finicky. You can now click Edit on a collapsed accordion item and the dialog opens correctly. Plus, long descriptions no longer break the layout — they wrap properly or truncate with an ellipsis.
+
+https://www.webiny.com/docs/release-notes/6.4.7/changelog