[Release note] New site dash GA for professional workspaces (#9778)

* Add release notes for new Site Dashboard GA

Pantheon has launched a new Site Dashboard experience for Professional Workspaces, featuring a modern design and improved performance while maintaining familiar workflows.

* Add image from second branch

* Add file extension for new release note entry

* Copy edits

* Mark as GA release

* Convert to alert for added clarity

* Delete unused image

* Update category

* opt out not an option

* readability fixes

* apply suggested edit

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Co-authored-by: Rachel <rachel@pantheon.io>

Author: stephpawlowski

source/releasenotes/2025-11-18-new-site-dashboard-now-default-for-professional-workspaces.md

@@ -0,0 +1,27 @@
+---
+title: "New Site Dashboard now generally available for Professional Workspaces"
+published_date: "2025-11-18"
+categories: [user-interface, new-feature]
+---
+Starting today, the new Site Dashboard enters General Availability for Professional Workspaces. Specfically, this release changes the following for Professional Workspaces:
+
+* The new experience is now the default, previously it could be enabled and disabled.
+* The option to disable the new experience has been removed.
+
+Personal Workspaces are not impacted, and still require opting in to enable the new experience.
+
+<Alert title="Note" type="info">
+
+The following highlights what users can expect in the new experience. Note these items have not been added or impacted by todays change but were delivered by our earlier [Beta release](/release-notes/2025/08/site-dashboard-beta#what-to-expect).
+
+</Alert>
+
+
+* **Same functionality, familiar workflows** – No need to relearn anything. Your day-to-day tasks remain unchanged.
+* **Modern, accessible design** – We’ve made significant improvements to align with the latest usability design standards, enhancing readability, contrast, and navigation.
+* **Performance improvements under the hood** – While this may feel mostly visual, we’ve reworked key infrastructure for long-term speed and reliability.
+* **Small but powerful UX upgrades** – New conveniences like one-click to copy the commit SHA, along with other thoughtful touches for enhanced usability.
+
+![Shows a preview of the new/fresh commit log](../images/release-notes/full-context-commit-history.png)
+
+