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/adapters/rss/src/lib.rs

@@ -10,21 +10,32 @@ pub struct RssAdapter {
     client: reqwest::Client,
 }
 
-impl RssAdapter {
-    pub fn new() -> Self {
+impl Default for RssAdapter {
+    fn default() -> Self {
         Self {
             client: reqwest::Client::new(),
         }
     }
 }
 
+impl RssAdapter {
+    pub fn new() -> Self {
+        Self::default()
+    }
+}
+
 impl DataSourcePort for RssAdapter {
     type Error = RssError;
 
     async fn poll(&self, source: &DataSource) -> Result<Value, Self::Error> {
         let url = source.config.url.as_ref().ok_or(RssError::NoUrl)?;
 
-        let resp = self.client.get(url).send().await.map_err(RssError::Request)?;
+        let resp = self
+            .client
+            .get(url)
+            .send()
+            .await
+            .map_err(RssError::Request)?;
         let xml = resp.text().await.map_err(RssError::Request)?;
 
         parser::parse_rss(&xml)

crates/adapters/rss/src/parser.rs

@@ -29,10 +29,10 @@ pub fn parse_rss(xml: &str) -> Result<Value, RssError> {
             }
             Ok(Event::End(e)) => {
                 let tag = String::from_utf8_lossy(e.name().as_ref()).to_string();
-                if tag == "item" {
-                    if let Some(item) = current_item.take() {
-                        items.push(Value::Object(item));
-                    }
+                if tag == "item"
+                    && let Some(item) = current_item.take()
+                {
+                    items.push(Value::Object(item));
                 }
                 current_tag.clear();
             }
@@ -52,10 +52,10 @@ pub fn parse_rss(xml: &str) -> Result<Value, RssError> {
             }
             Ok(Event::CData(e)) => {
                 let text = String::from_utf8_lossy(&e).to_string();
-                if !current_tag.is_empty() {
-                    if let Some(item) = current_item.as_mut() {
-                        item.insert(current_tag.clone(), Value::String(text));
-                    }
+                if !current_tag.is_empty()
+                    && let Some(item) = current_item.as_mut()
+                {
+                    item.insert(current_tag.clone(), Value::String(text));
                 }
             }
             Ok(Event::Eof) => break,

crates/adapters/rss/tests/parser_tests.rs

@@ -1,5 +1,5 @@
 use domain::Value;
-use rss_adapter::{parse_rss, RssError};
+use rss_adapter::{RssError, parse_rss};
 
 const SAMPLE_RSS: &str = r#"<?xml version="1.0" encoding="UTF-8"?>
     <rss version="2.0">
@@ -23,8 +23,20 @@ const SAMPLE_RSS: &str = r#"<?xml version="1.0" encoding="UTF-8"?>
 fn parses_rss_into_value() {
     let result = parse_rss(SAMPLE_RSS).unwrap();
 
-    assert_eq!(result.get_path("$.title"), Some(&Value::String("Test Feed".into())));
-    assert_eq!(result.get_path("$.items[0].title"), Some(&Value::String("First Article".into())));
-    assert_eq!(result.get_path("$.items[1].title"), Some(&Value::String("Second Article".into())));
-    assert_eq!(result.get_path("$.items[0].description"), Some(&Value::String("Description of first article".into())));
+    assert_eq!(
+        result.get_path("$.title"),
+        Some(&Value::String("Test Feed".into()))
+    );
+    assert_eq!(
+        result.get_path("$.items[0].title"),
+        Some(&Value::String("First Article".into()))
+    );
+    assert_eq!(
+        result.get_path("$.items[1].title"),
+        Some(&Value::String("Second Article".into()))
+    );
+    assert_eq!(
+        result.get_path("$.items[0].description"),
+        Some(&Value::String("Description of first article".into()))
+    );
 }