Fix Qdrant URL input default value

[daniel-lxs]

Set a default value in ExtensioStateContext for the Qdrant URL

---

Important

Sets default codebaseIndexQdrantUrl in SettingsView.tsx to ensure indexing starts without user input.

• Behavior:
  • Sets default codebaseIndexQdrantUrl to "http://localhost:6333" in codebaseIndexConfig within SettingsView.tsx.
  • Ensures indexing process can start without user-provided URL.

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