chore: bump version to 2.0.51

update changelog to 2.0.51

Log: update changelog to 2.0.51

Author: mhduiy

debian/changelog

@@ -1,3 +1,14 @@
+dde-shell (2.0.51) unstable; urgency=medium
+
+  * fix(dock): correct AppItemBackground hovered color and outer border
+    logic in efficient mode
+  * fix: fix bubble list layout update on height change
+  * fix: cache appearance opacity in the shell
+  * fix(osd): read Wayland brightness from Treeland instead of Display1
+  * fix(dock): smart hide fails to show dock after window dragged away
+
+ -- zhangkun <zhangkun2@uniontech.com>  Thu, 16 Jul 2026 21:37:56 +0800
+
 dde-shell (2.0.50) unstable; urgency=medium
 
   * fix: prioritize notification-specific image hints in appIcon