feat(web): render configured app_name for brand + login; drop hardcoded app.name (#54)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

web/src/shell/sidebar.tsx

@@ -15,6 +15,7 @@ import type { LucideIcon } from "lucide-react";
 import { cn } from "@/lib/utils";
 import { Tooltip } from "@/components/ui/tooltip";
 import { useMediaQuery } from "@/lib/use-media-query";
+import { useConfig } from "../config/config-context";
 
 const STORAGE_KEY = "sidebar-collapsed";
 
@@ -50,6 +51,7 @@ function navLinkClass(collapsed: boolean) {
 
 export function Sidebar() {
   const { t } = useTranslation();
+  const { app_name } = useConfig();
   const narrow = useMediaQuery("(max-width: 768px)");
   const [stored, setStored] = useState(readStored);
 
@@ -73,7 +75,7 @@ export function Sidebar() {
       )}
     >
       <div className="mb-4 flex items-center justify-between">
-        {!collapsed && <span className="font-semibold">{t("app.name")}</span>}
+        {!collapsed && <span className="font-semibold">{app_name}</span>}
         <button
           type="button"
           onClick={toggle}