fix: Sidebar flickering during drag operations in compact mode, b=bug #10942, p=#11015

* fix:sidebar flickering during drag operations in compact mode

* fix: streamline drag state cleanup in compact mode

* fix: remove redundant event listener tracking for drag state cleanup

* fix: refactor drag state cleanup for improved readability and consistency

* feat: Dont check for child elemenets, b=no-bug, c=compact-mode
---------

Signed-off-by: mr. m <[email protected]>
Co-authored-by: mr. m <[email protected]>

Author: sibteali786

src/zen/compact-mode/ZenCompactMode.mjs

@@ -715,7 +715,10 @@ var gZenCompactModeManager = {
             (document.documentElement.getAttribute('supress-primary-adjustment') === 'true' &&
               gZenVerticalTabsManager._hasSetSingleToolbar) ||
             this._hasHoveredUrlbar ||
-            this._ignoreNextHover
+            this._ignoreNextHover ||
+            (event.type === 'dragleave' &&
+              event.explicitOriginalTarget !== target &&
+              target.contains?.(event.explicitOriginalTarget))
           ) {
             return;
           }