feat: provide a way for a development frontend to specify use of a local registry

[turbocrime]

No description provided.

[conorsch]

#118 shows one attempt to achieve this. Separately, @TalDerei recommended using pnpm overrides in the prax package.json, e.g.

--- a/package.json
+++ b/package.json
@@ -52,5 +52,10 @@
     "typescript": "^5.5.4",
     "typescript-eslint": "^8.16.0",
     "vitest": "1.x"
+  },
+  "pnpm": {
+    "overrides": {
+      "@penumbra-labs/registry": "file:../prax-registry/npm/"
+    }
   }
 }

However, I haven't gotten that working myself yet: before and after using the override, the 1000transfer/channel-27/uosmo in my testnet wallet displays as Osmo in the UI:

I would have expected that behavior before the override, but after the override including #124, I expect to see the asset as an "unknown asset".