experimental/SelectPanel v2: Fix heading color (#4757)

* set default foreground color for dialog

* Create real-bees-vanish.md

* test(vrt): update snapshots

---------

Co-authored-by: siddharthkp <[email protected]>

Author: siddharthkp

.changeset/real-bees-vanish.md

@@ -0,0 +1,5 @@
+---
+"@primer/react": patch
+---
+
+experimental/SelectPanel v2: Fix heading color for dark themes

.playwright/snapshots/components/drafts/SelectPanel.test.ts-snapshots/drafts-SelectPanel-Default-dark-colorblind-linux.png

@@ -249,6 +249,7 @@ const Panel: React.FC<SelectPanelProps> = ({
           // reset dialog default styles
           border: 'none',
           padding: 0,
+          color: 'fg.default',
           '&[open]': {display: 'flex'}, // to fit children
 
           '&[data-variant="anchored"], &[data-variant="full-screen"]': {