Fix run badge anchoring (#7912)

## Summary
Restore the shared button's positioning context so the run-queue badge
anchors to the correct spot.

## Changes
- **What**: add `position: relative` back to `button.variants.ts` so
badge overlays stay attached to their buttons

## Review Focus
- Make sure no buttons rely on being `position: static` (should be
unaffected) and that the run badge now sits beside the Run button
instead of the window edge.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-7912-Fix-run-badge-anchoring-2e26d73d365081aa8fefe5381f37cfa4)
by [Unito](https://www.unito.io)

---------

Co-authored-by: github-actions <github-actions@github.com>

src/components/ui/button/button.variants.ts

@@ -2,7 +2,7 @@ import type { VariantProps } from 'cva'
 import { cva } from 'cva'
 
 export const buttonVariants = cva({
-  base: 'inline-flex items-center justify-center gap-2 cursor-pointer whitespace-nowrap appearance-none border-none rounded-md text-sm font-medium font-inter transition-colors focus-visible:outline-none focus-visible:ring-1 focus-visible:ring-ring disabled:pointer-events-none disabled:opacity-50 [&_svg]:pointer-events-none [&_svg]:size-4 [&_svg]:shrink-0',
+  base: 'relative inline-flex items-center justify-center gap-2 cursor-pointer whitespace-nowrap appearance-none border-none rounded-md text-sm font-medium font-inter transition-colors focus-visible:outline-none focus-visible:ring-1 focus-visible:ring-ring disabled:pointer-events-none disabled:opacity-50 [&_svg]:pointer-events-none [&_svg]:size-4 [&_svg]:shrink-0',
   variants: {
     variant: {
       secondary: