fix: workspace theme review fixes

- Light mode scrollbar-bg: #1a1a1a (black) -> #e8eaed (light gray)
- Dark mode btn-delete-text: #062e6f (navy) -> #ffffff (white)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: renemadsen

eform-client/src/scss/themes/_workspace.scss

@@ -147,7 +147,7 @@ $workspace-tokens: (
       surface-error-message: #ffebee,
 
       spinner-overlay-bg: #{rgba(0, 0, 0, 0.3)},
-      scrollbar-bg: #1a1a1a,
+      scrollbar-bg: #e8eaed,
       pell-actionbar-bg: #ffffff,
       progress-fill: #319C4C,
       progress-track: lightgrey,
@@ -184,7 +184,7 @@ $workspace-tokens: (
       text-header: #e3e3e3,
       text-body: #c4c7c5,
       card: #28292e,
-      btn-delete-text: #062e6f,
+      btn-delete-text: #ffffff,
       mdc-theme-primary: #a8c7fa,
       mdc-theme-primary-dark: #c2d7fc,
       tp-td-bg: #28292e,