feat(swap): Use art_client to dial over Tor (#196)

- Upgrade `sqlx` to `0.8`
- Use `arti_client@0.24` in combination with [`libp2p-community-tor`](https://crates.io/crates/libp2p-community-tor/0.4.1). https://github.com/umgefahren/libp2p-tor/pull/18 was required for this.
- Display spinner in GUI while Tor circuits are being established
- Remove unused dependencies (`once_cell`, `tauri-plugin-devtools`, `digest`, `hyper`, `itertools`, `erased_serde`)
- Bundle roboto font from npm registry

src-tauri/src/lib.rs

@@ -299,6 +299,7 @@ async fn initialize_context(
         })
         .with_json(false)
         .with_debug(true)
+        .with_tor(true)
         .with_tauri(tauri_handle.clone())
         .build()
         .await;