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/client-application/src/client_app.rs

@@ -1,9 +1,7 @@
-use std::collections::HashMap;
-use domain::LayoutNode;
 use client_domain::{BoundingBox, LayoutEngine, RenderTree};
-use protocol::{
-    ServerMessage, WidgetDescriptor, WireDisplayHint, WireWidgetState, WireLayoutNode,
-};
+use domain::LayoutNode;
+use protocol::{ServerMessage, WidgetDescriptor, WireDisplayHint, WireLayoutNode, WireWidgetState};
+use std::collections::HashMap;
 
 pub struct ClientApp {
     screen: BoundingBox,
@@ -33,9 +31,7 @@ impl ClientApp {
             ServerMessage::ScreenUpdate { layout, widgets } => {
                 self.handle_screen_update(layout, widgets)
             }
-            ServerMessage::DataUpdate { widgets } => {
-                self.handle_data_update(widgets)
-            }
+            ServerMessage::DataUpdate { widgets } => self.handle_data_update(widgets),
             ServerMessage::Heartbeat => Vec::new(),
         }
     }
@@ -50,7 +46,8 @@ impl ClientApp {
 
         self.widget_states.clear();
         for w in &widgets {
-            self.widget_states.insert(w.id, (w.display_hint.clone(), w.state.clone()));
+            self.widget_states
+                .insert(w.id, (w.display_hint.clone(), w.state.clone()));
         }
 
         let repaints = self.build_repaints_for_all(&new_tree);
@@ -58,10 +55,7 @@ impl ClientApp {
         repaints
     }
 
-    fn handle_data_update(
-        &mut self,
-        widgets: Vec<WidgetDescriptor>,
-    ) -> Vec<RepaintCommand> {
+    fn handle_data_update(&mut self, widgets: Vec<WidgetDescriptor>) -> Vec<RepaintCommand> {
         let tree = match &self.render_tree {
             Some(t) => t,
             None => return Vec::new(),
@@ -70,9 +64,10 @@ impl ClientApp {
         let mut repaints = Vec::new();
 
         for w in widgets {
-            let changed = self.widget_states
+            let changed = self
+                .widget_states
                 .get(&w.id)
-                .map_or(true, |(_, prev_state)| *prev_state != w.state);
+                .is_none_or(|(_, prev_state)| *prev_state != w.state);
 
             if changed {
                 if let Some(bounds) = tree.get_widget_bounds(w.id) {

crates/client-application/tests/client_app_tests.rs

@@ -1,9 +1,8 @@
 use client_application::{ClientApp, RepaintCommand};
 use client_domain::BoundingBox;
 use protocol::{
-    ServerMessage, WidgetDescriptor,
-    WireDisplayHint, WireLayoutNode, WireContainerNode, WireLayoutChild,
-    WireDirection, WireSizing, WireWidgetState, WireKeyValue, WireValue,
+    ServerMessage, WidgetDescriptor, WireContainerNode, WireDirection, WireDisplayHint,
+    WireKeyValue, WireLayoutChild, WireLayoutNode, WireSizing, WireValue, WireWidgetState,
 };
 
 fn screen() -> BoundingBox {
@@ -15,9 +14,10 @@ fn weather_descriptor(id: u16, temp: &str) -> WidgetDescriptor {
         id,
         display_hint: WireDisplayHint::IconValue,
         state: WireWidgetState {
-            data: vec![
-                WireKeyValue { key: "temperature".into(), value: WireValue::String(temp.into()) },
-            ],
+            data: vec![WireKeyValue {
+                key: "temperature".into(),
+                value: WireValue::String(temp.into()),
+            }],
             error: None,
         },
     }
@@ -29,8 +29,14 @@ fn two_widget_layout() -> WireLayoutNode {
         gap: 0,
         padding: 0,
         children: vec![
-            WireLayoutChild { sizing: WireSizing::Flex(1), node: WireLayoutNode::Leaf(1) },
-            WireLayoutChild { sizing: WireSizing::Flex(1), node: WireLayoutNode::Leaf(2) },
+            WireLayoutChild {
+                sizing: WireSizing::Flex(1),
+                node: WireLayoutNode::Leaf(1),
+            },
+            WireLayoutChild {
+                sizing: WireSizing::Flex(1),
+                node: WireLayoutNode::Leaf(2),
+            },
         ],
     })
 }
@@ -116,8 +122,14 @@ fn second_screen_update_repaints_all_widgets_with_new_layout() {
         gap: 0,
         padding: 0,
         children: vec![
-            WireLayoutChild { sizing: WireSizing::Flex(1), node: WireLayoutNode::Leaf(1) },
-            WireLayoutChild { sizing: WireSizing::Flex(1), node: WireLayoutNode::Leaf(2) },
+            WireLayoutChild {
+                sizing: WireSizing::Flex(1),
+                node: WireLayoutNode::Leaf(1),
+            },
+            WireLayoutChild {
+                sizing: WireSizing::Flex(1),
+                node: WireLayoutNode::Leaf(2),
+            },
         ],
     });