feat: add SettingsPage with HuggingFace model search and fix flexbox layout

- Add SettingsPage component with macOS/Linear-style settings UI (sp-* classes)
- Fix HuggingFace results list squeeze: sp-card-row--full now has align-items: stretch
  overriding the inherited flex-start, ensuring children fill 100% horizontal width
- Fix sp-hf-file row layout: width 100%, grid columns for name/quant/size/download
- Fix sp-hf-name truncation: explicit overflow/ellipsis/white-space in CSS
- Add white-space: nowrap to sp-hf-size and sp-hf-quant-badge to protect secondary columns
- Add runtime-deps crate, Tailwind/PostCSS config, runtime-defaults, MessageBubble test
- Update Cargo workspace, inference-server, tauri runtime types and process handling

crates/inference-server/src/routes.rs

@@ -397,9 +397,17 @@ async fn stream_response(
         }
     };
 
-    Sse::new(stream)
+    let response = Sse::new(stream)
         .keep_alive(KeepAlive::default())
-        .into_response()
+        .into_response();
+
+    axum::response::Response::builder()
+        .status(response.status())
+        .header("content-type", "text/event-stream; charset=utf-8")
+        .header("cache-control", "no-cache")
+        .header("connection", "keep-alive")
+        .body(response.into_body())
+        .unwrap()
 }
 
 async fn blocking_response(