Fix light mode table colors (#2873)

* fix light mode table colors

* fix table styles from being overwritten in other sections that are not chat messages

---------

Co-authored-by: Timothy Carambat <rambat1010@gmail.com>

frontend/src/index.css

@@ -116,6 +116,7 @@
   border-color: var(--theme-sidebar-border);
 }
 
+
 /*
 This is to override the default border color for the select and input elements
 in the onboarding flow when the theme is not light. This only applies to the
@@ -774,6 +775,10 @@ dialog::backdrop {
   color: #fff;
 }
 
+[data-theme="light"] .markdown table {
+  @apply invert;
+}
+
 .file-row:nth-child(even) {
   @apply bg-theme-bg-primary;
   background-color: var(--theme-file-row-even);