feat(ui): phase 5 — graphs, widgets, theming, PWA, boards, i18n

P5a: 24h uptime bar strip + latency chart on monitor detail, iframe
embed widget, generic JSON-path widget, accent/wallpaper/custom CSS
settings, PWA manifest + service worker, demo GIF.

P5b: transport picker + per-transport fields + test button in
settings; per-monitor alert-rule fields in dialogs.

P5c: container cpu/mem columns, SMART/ZFS/GPU sections on system
detail, subdomains section on domain detail.

P5d: login/setup page + auth middleware client handling, board
switcher + /b/:slug routes, full string extraction to typed t() keys
with {param} interpolation, complete cs locale, language select.

Authored By: TDvorak <[email protected]>

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

apps/frontend/src/components/ui/dialog.tsx

@@ -3,6 +3,7 @@ import * as DialogPrimitive from "@radix-ui/react-dialog";
 import { X } from "lucide-react";
 
 import { cn } from "@/lib/utils";
+import { t } from "@/i18n";
 
 const Dialog = DialogPrimitive.Root;
 const DialogTrigger = DialogPrimitive.Trigger;
@@ -27,7 +28,7 @@ function DialogContent({
 				{showCloseButton ? (
 					<DialogPrimitive.Close className="absolute right-4 top-4 rounded-md p-1 text-text-faint transition-colors hover:bg-surface-hover hover:text-text focus-visible:outline-none focus-visible:ring-1 focus-visible:ring-ring">
 						<X size={14} />
-						<span className="sr-only">Close</span>
+						<span className="sr-only">{t("common.close")}</span>
 					</DialogPrimitive.Close>
 				) : null}
 			</DialogPrimitive.Content>