add SPA config UI, wire media/rss adapters, event-driven layout push

- React SPA: dashboard, data sources CRUD, widgets CRUD, layout builder,
  presets. TanStack Router + Query, shadcn/ui, Vite proxy to :3000
- wire media + rss adapters into polling loop, remove xtb source type
- media adapter: read username/password from headers, proper subsonic auth
- event handler: subscribe to LayoutChanged, push screen update to clients
- fix clippy warnings across workspace (Default impls, collapsible ifs,
  redundant closures, is_none_or, unused imports)

crates/domain/src/ports/broadcast.rs

@@ -1,6 +1,6 @@
-use std::future::Future;
 use crate::entities::WidgetId;
 use crate::value_objects::{Layout, WidgetState};
+use std::future::Future;
 
 pub trait BroadcastPort {
     type Error;

crates/domain/src/ports/config_repository.rs

@@ -1,27 +1,53 @@
-use std::future::Future;
 use crate::entities::{
     DataSource, DataSourceId, LayoutPreset, LayoutPresetId, WidgetConfig, WidgetId,
 };
 use crate::value_objects::Layout;
+use std::future::Future;
 
 pub trait ConfigRepository {
     type Error;
 
-    fn get_widget(&self, id: WidgetId) -> impl Future<Output = Result<Option<WidgetConfig>, Self::Error>> + Send;
+    fn get_widget(
+        &self,
+        id: WidgetId,
+    ) -> impl Future<Output = Result<Option<WidgetConfig>, Self::Error>> + Send;
     fn list_widgets(&self) -> impl Future<Output = Result<Vec<WidgetConfig>, Self::Error>> + Send;
-    fn save_widget(&self, config: &WidgetConfig) -> impl Future<Output = Result<(), Self::Error>> + Send;
+    fn save_widget(
+        &self,
+        config: &WidgetConfig,
+    ) -> impl Future<Output = Result<(), Self::Error>> + Send;
     fn delete_widget(&self, id: WidgetId) -> impl Future<Output = Result<(), Self::Error>> + Send;
 
-    fn get_data_source(&self, id: DataSourceId) -> impl Future<Output = Result<Option<DataSource>, Self::Error>> + Send;
-    fn list_data_sources(&self) -> impl Future<Output = Result<Vec<DataSource>, Self::Error>> + Send;
-    fn save_data_source(&self, source: &DataSource) -> impl Future<Output = Result<(), Self::Error>> + Send;
-    fn delete_data_source(&self, id: DataSourceId) -> impl Future<Output = Result<(), Self::Error>> + Send;
+    fn get_data_source(
+        &self,
+        id: DataSourceId,
+    ) -> impl Future<Output = Result<Option<DataSource>, Self::Error>> + Send;
+    fn list_data_sources(
+        &self,
+    ) -> impl Future<Output = Result<Vec<DataSource>, Self::Error>> + Send;
+    fn save_data_source(
+        &self,
+        source: &DataSource,
+    ) -> impl Future<Output = Result<(), Self::Error>> + Send;
+    fn delete_data_source(
+        &self,
+        id: DataSourceId,
+    ) -> impl Future<Output = Result<(), Self::Error>> + Send;
 
     fn get_layout(&self) -> impl Future<Output = Result<Option<Layout>, Self::Error>> + Send;
     fn save_layout(&self, layout: &Layout) -> impl Future<Output = Result<(), Self::Error>> + Send;
 
-    fn get_preset(&self, id: LayoutPresetId) -> impl Future<Output = Result<Option<LayoutPreset>, Self::Error>> + Send;
+    fn get_preset(
+        &self,
+        id: LayoutPresetId,
+    ) -> impl Future<Output = Result<Option<LayoutPreset>, Self::Error>> + Send;
     fn list_presets(&self) -> impl Future<Output = Result<Vec<LayoutPreset>, Self::Error>> + Send;
-    fn save_preset(&self, preset: &LayoutPreset) -> impl Future<Output = Result<(), Self::Error>> + Send;
-    fn delete_preset(&self, id: LayoutPresetId) -> impl Future<Output = Result<(), Self::Error>> + Send;
+    fn save_preset(
+        &self,
+        preset: &LayoutPreset,
+    ) -> impl Future<Output = Result<(), Self::Error>> + Send;
+    fn delete_preset(
+        &self,
+        id: LayoutPresetId,
+    ) -> impl Future<Output = Result<(), Self::Error>> + Send;
 }

crates/domain/src/ports/data_source_port.rs

@@ -1,6 +1,6 @@
-use std::future::Future;
 use crate::entities::DataSource;
 use crate::value_objects::Value;
+use std::future::Future;
 
 pub trait DataSourcePort {
     type Error;

crates/domain/src/ports/event.rs

@@ -1,5 +1,5 @@
-use std::future::Future;
 use crate::events::DomainEvent;
+use std::future::Future;
 
 pub trait EventPublisher {
     type Error;

crates/domain/src/ports/mod.rs

@@ -1,9 +1,9 @@
+mod broadcast;
 mod config_repository;
 mod data_source_port;
-mod broadcast;
 mod event;
 
+pub use broadcast::BroadcastPort;
 pub use config_repository::ConfigRepository;
 pub use data_source_port::DataSourcePort;
-pub use broadcast::BroadcastPort;
 pub use event::EventPublisher;