fix: vertically center menu item content in workspace theme

Override align-items: flex-start with center so text and icons are
vertically centered within the 32px menu item height.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: renemadsen

eform-client/src/scss/components/_workspace-overrides.scss

@@ -151,6 +151,7 @@ body.theme-workspace {
     color: var(--text-header, #1f1f1f) !important;
     height: 32px !important;
     min-height: 32px !important;
+    align-items: center !important;
     padding: 0 12px !important;
     line-height: 20px !important;
     font-family: var(--font-family) !important;