fix: inconsistent text color in release notes last line (#11480)

Move color and font-size styles from p selector to container level
in UpdateNotesWrapper. This ensures all content (including li elements
not wrapped in p tags) uses consistent color.

The issue occurred because .replace(/\n/g, '\n\n') creates a "loose list"
in Markdown where most list items get wrapped in <p> tags, but the last
item (without trailing newline) may not, causing it to inherit a different
color from the parent .markdown class.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude <noreply@anthropic.com>

src/renderer/src/pages/settings/AboutSettings.tsx

@@ -404,11 +404,11 @@ const UpdateNotesWrapper = styled.div`
   margin: 8px 0;
   background-color: var(--color-bg-2);
   border-radius: 6px;
+  color: var(--color-text-2);
+  font-size: 14px;
 
   p {
     margin: 0;
-    color: var(--color-text-2);
-    font-size: 14px;
   }
 `