feat(diagnostics): in-app log viewer in Wallet settings

src-tauri/Cargo.toml

@@ -32,6 +32,7 @@ tokio-util = { workspace = true }
 postcard = { workspace = true }
 dirs = { workspace = true }
 tracing = { workspace = true }
+tracing-subscriber = { workspace = true }
 
 [dev-dependencies]
 tauri = { version = "2", features = ["test"] }
@@ -66,5 +67,6 @@ postcard = "1.1"
 bech32 = "0.11"
 dirs = "5"
 tracing = "0.1"
+tracing-subscriber = { version = "0.3", features = ["env-filter"] }
 sha2 = "0.10"
 base64 = "0.22"

src-tauri/src/commands/server.rs

@@ -236,6 +236,20 @@ pub async fn tunnel_status(state: State<'_, AppState>) -> AppResult<TunnelStatus
     Ok(tunnel::status(&state).await)
 }
 
+/// The in-memory application log (oldest line first), for display + copy in the
+/// app. Captured from `tracing` since app start; bounded and not persisted.
+#[tauri::command]
+pub async fn get_logs() -> AppResult<Vec<String>> {
+    Ok(crate::logbuf::global().snapshot())
+}
+
+/// Discard the buffered log lines.
+#[tauri::command]
+pub async fn clear_logs() -> AppResult<()> {
+    crate::logbuf::global().clear();
+    Ok(())
+}
+
 #[tauri::command]
 pub async fn sidecar_status(state: State<'_, AppState>) -> AppResult<SidecarStatus> {
     sidecar::status(&state).await

src-tauri/src/lib.rs

@@ -1,5 +1,6 @@
 pub mod commands;
 pub mod error;
+pub mod logbuf;
 pub mod sidecar;
 pub mod state;
 pub mod tunnel;
@@ -44,6 +45,10 @@ async fn run_auto_lock_monitor<R: tauri::Runtime>(app: tauri::AppHandle<R>) {
 }
 
 pub fn run() {
+    // Start capturing `tracing` output (to stdout + the in-app log buffer) before
+    // anything else runs, so early diagnostics are recorded too.
+    logbuf::init_logging();
+
     tauri::Builder::default()
         .plugin(tauri_plugin_shell::init())
         .manage(AppState::new())
@@ -106,6 +111,8 @@ pub fn run() {
             commands::server::start_tunnel,
             commands::server::stop_tunnel,
             commands::server::tunnel_status,
+            commands::server::get_logs,
+            commands::server::clear_logs,
             commands::dkg::start_dkg,
             commands::dkg::cancel_ceremony,
             commands::signing::create_signing_session,