fix: electrum timeout type and pin bitcoind for tests

- electrum-client 0.25 takes Duration for timeout, not u8
- revert bitcoind dev-dep to 0.36 to keep test framework compiling

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: i5hi

Cargo.toml

@@ -78,7 +78,7 @@ tokio = { version = "1.43.0", features = ["rt", "macros"] }
 anyhow = "1.0.100"
 
 [target.'cfg(not(all(target_family = "wasm", target_os = "unknown")))'.dev-dependencies]
-bitcoind = { version = "0.40.0", features = ["25_2"] }
+bitcoind = { version = "0.36.0", features = ["25_0"] }
 elementsd = { version = "0.11.0", features = ["22_1_1"] }
 
 [target.'cfg(all(target_family = "wasm", target_os = "unknown"))'.dev-dependencies]

src/network/electrum.rs

@@ -25,7 +25,7 @@ enum ElectrumUrl {
 impl ElectrumUrl {
     pub fn build_client(&self, timeout: u8) -> Result<electrum_client::Client, Error> {
         let builder = electrum_client::ConfigBuilder::new();
-        let builder = builder.timeout(Some(timeout));
+        let builder = builder.timeout(Some(std::time::Duration::from_secs(timeout as u64)));
         let (url, builder) = match self {
             ElectrumUrl::Tls(url, validate) => {
                 (format!("ssl://{url}"), builder.validate_domain(*validate))