Bumped tailwind-merge to 3.5.0 in Shade (TryGhost#27422)

ref
https://linear.app/ghost/issue/DES-1351/buttons-look-broken-possibly-from-tailwind-4

- v2.6 doesn't understand Tailwind v4's `h-(--var)` syntax, so className
overrides couldn't dedupe defaults like `h-(--control-height)`
- surfaced as inline follow buttons in ActivityPub rendering as pills
instead of 16px circles

Author: minimaluminium

apps/shade/package.json

@@ -155,7 +155,7 @@
         "react-world-flags": "1.6.0",
         "recharts": "2.15.4",
         "sonner": "2.0.7",
-        "tailwind-merge": "2.6.0",
+        "tailwind-merge": "3.5.0",
         "validator": "13.12.0",
         "zod": "4.1.12"
     },