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/widgets/immich.tsx

@@ -1,5 +1,6 @@
 import type { Item } from "@/types";
 import type { WidgetData } from "@/widgets/index";
+import { t } from "@/i18n";
 
 // Immich — photo/video counts and library footprint.
 
@@ -24,10 +25,10 @@ export function ImmichWidget({ item, data, error }: { item: Item; data: WidgetDa
 				<span className="font-mono text-[22px] font-medium leading-none tracking-tight tabular-nums">
 					{data ? fmtNum(num(data, "photos")) : "…"}
 				</span>
-				<span className="text-[10.5px] uppercase tracking-[0.1em] text-text-faint">photos</span>
+				<span className="text-[10.5px] uppercase tracking-[0.1em] text-text-faint">{t("widget.photosLbl")}</span>
 			</div>
 			<div className="ml-auto flex flex-col items-end gap-1 font-mono text-[10.5px] text-text-faint">
-				<span>{fmtNum(num(data, "videos"))} videos</span>
+				<span>{t("widget.videos", { n: fmtNum(num(data, "videos")) })}</span>
 				<span>{fmtBytes(num(data, "usageBytes"))}</span>
 			</div>
 		</div>