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/renderers/cards/index.tsx

@@ -1,5 +1,6 @@
 import { ChevronDown, GripVertical, Pencil, Trash2 } from "lucide-react";
 import { cn } from "@/lib/utils";
+import { t } from "@/i18n";
 import { useItemDnd, useSectionDnd } from "@/board/dnd";
 import { IconImg, ItemAnchor, StatusChip, hostOf } from "@/board/primitives";
 import { WidgetContent } from "@/widgets";
@@ -32,7 +33,7 @@ function SectionView({ section, onToggle, onDelete, children }: SectionViewProps
 				</button>
 				<button
 					type="button"
-					aria-label="Drag section"
+					aria-label={t("renderer.dragSection")}
 					className="cursor-grab text-text-faint opacity-0 transition-opacity group-hover/sec:opacity-100 active:cursor-grabbing"
 					{...dnd.attributes}
 					{...dnd.listeners}
@@ -41,7 +42,7 @@ function SectionView({ section, onToggle, onDelete, children }: SectionViewProps
 				</button>
 				<button
 					type="button"
-					aria-label="Delete section"
+					aria-label={t("renderer.deleteSection")}
 					onClick={onDelete}
 					className="text-text-faint opacity-0 transition-opacity hover:text-destructive group-hover/sec:opacity-100"
 				>