feat: frontend MVP — auth, timeline, upload, albums, admin, image viewer

Backend:
- user roles (DB + JWT + first-user-is-admin)
- volume-aware file resolver (multi-volume asset serving)
- directory scanner uses volume URI directly
- date-summary endpoint (capture date from EXIF)
- timeline ordered by capture date
- list endpoints: volumes, plugins, pipelines, library paths
- delete endpoints: volumes, library paths
- configurable upload body limit (MAX_UPLOAD_BYTES)

Frontend:
- auth: login/register, token refresh, role-based admin gate
- timeline: date-grouped grid, infinite scroll, date scrubber
- image viewer: fullscreen zoom/pan/pinch, metadata sidebar
- upload: drag-drop, sequential upload, progress tracking
- albums: create, add/remove photos, asset picker dialog
- admin: storage (import library), jobs (pagination, error details),
  plugins (list + toggle), pipelines, sidecars, duplicates
- multi-select mode with add-to-album action
- TanStack Query for all data fetching

k-photos-frontend/components/ui/calendar.tsx

@@ -87,6 +87,7 @@ function Calendar({
             : "flex items-center gap-1 rounded-(--cell-radius) text-sm [&>svg]:size-3.5 [&>svg]:text-muted-foreground",
           defaultClassNames.caption_label
         ),
+        // @ts-expect-error react-day-picker v10 type mismatch
         table: "w-full border-collapse",
         weekdays: cn("flex", defaultClassNames.weekdays),
         weekday: cn(

k-photos-frontend/components/ui/dialog.tsx

@@ -61,7 +61,7 @@ function DialogContent({
       <DialogPrimitive.Content
         data-slot="dialog-content"
         className={cn(
-          "fixed top-1/2 left-1/2 z-50 grid w-full max-w-[calc(100%-2rem)] -translate-x-1/2 -translate-y-1/2 gap-6 rounded-xl bg-popover p-6 text-sm text-popover-foreground ring-1 ring-foreground/10 duration-100 outline-none sm:max-w-md data-open:animate-in data-open:fade-in-0 data-open:zoom-in-95 data-closed:animate-out data-closed:fade-out-0 data-closed:zoom-out-95",
+          "fixed top-1/2 left-1/2 z-50 grid w-full max-w-[calc(100%-2rem)] max-h-[calc(100vh-2rem)] -translate-x-1/2 -translate-y-1/2 gap-6 overflow-y-auto rounded-xl bg-popover p-6 text-sm text-popover-foreground ring-1 ring-foreground/10 duration-100 outline-none sm:max-w-md data-open:animate-in data-open:fade-in-0 data-open:zoom-in-95 data-closed:animate-out data-closed:fade-out-0 data-closed:zoom-out-95",
           className
         )}
         {...props}