fix: align @tiptap/pm and @tiptap/starter-kit to 3.27.3

Bump @tiptap/pm and @tiptap/starter-kit from 3.27.1 to 3.27.3, matching
@tiptap/vue-3 which was already at 3.27.3. This resolves CI typecheck
errors caused by two different versions of @tiptap/core (3.27.1 and
3.27.3) being installed simultaneously, which led to:

- StarterKit type mismatch with AnyExtension
- Extension commands (toggleBold, toggleItalic, etc.) missing from
  ChainedCommands due to declaration merging across mismatched modules

Author: shahboura

package.json

@@ -42,8 +42,8 @@
     "@regexper/render": "^1.0.0",
     "@sindresorhus/slugify": "^3.0.0",
     "@tabler/icons-vue": "^3.44.0",
-    "@tiptap/pm": "3.27.1",
-    "@tiptap/starter-kit": "3.27.1",
+    "@tiptap/pm": "3.27.3",
+    "@tiptap/starter-kit": "3.27.3",
     "@tiptap/vue-3": "3.27.3",
     "@types/markdown-it": "^14.1.2",
     "@vicons/material": "^0.13.0",