fix(workspace): pin React and React-DOM to a single version via pnpm overrides

While migrating CreateNoteModal to use @bytelyst/ui Input/Select/Textarea
(which internally call React.useId), Vitest tests failed with:

  TypeError: Cannot read properties of null (reading 'useId')

Root cause: the web package pins react@19.2.0 but @bytelyst/ui declared
react: '^19.0.0' as a peer, so pnpm resolved 19.2.6 for it from the
common-platform side. Two React copies coexisted (19.2.0 and 19.2.6),
the @bytelyst/ui components linked against one and react-dom test-rendered
against the other, and useId failed because the dispatcher belonged to
a different React instance than the consumer.

Fix: declare pnpm.overrides in the workspace root so the entire monorepo
resolves to a single react@19.2.0 / react-dom@19.2.0 pair. Verified via
'pnpm why react' (all transitive references now point at 19.2.0) and the
on-disk symlinks (web/node_modules/@bytelyst/ui/node_modules/react and
common-plat/packages/ui/node_modules/react both link to
.pnpm/react@19.2.0).

package.json

@@ -20,5 +20,11 @@
   },
   "devDependencies": {
     "husky": "^9.0.0"
+  },
+  "pnpm": {
+    "overrides": {
+      "react": "19.2.0",
+      "react-dom": "19.2.0"
+    }
   }
 }