fix(web): unify display-field spacing (shared Field) + clearer layout help

- Every option in the custom form now renders through one `Field` wrapper (label →
  control → help at a consistent `space-y-3`), so the label→input gap is roomier and
  identical across keep-alive, the button groups, and max-displays — the first field no
  longer spaces differently from the rest.
- Reworded the multi-monitor layout help: it now says Auto is side-by-side and Manual
  gives a per-display X/Y editor "in the Live displays section below once two or more are
  streaming" — instead of pointing at an "arrangement table" that isn't visible until
  clients connect.

web tsc + vite build + biome-lint green; deployed on .21.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

web/messages/de.json

@@ -100,7 +100,7 @@
 	"display_identity_per_client": "Pro Client",
 	"display_identity_per_client_mode": "Pro Client + Auflösung",
 	"display_layout_mode": "Multi-Monitor-Anordnung",
-	"display_layout_help": "Wie mehrere Anzeigen auf dem Desktop angeordnet werden. Manuell nutzt die Anordnungstabelle unten (ab 2 Anzeigen).",
+	"display_layout_help": "Automatisch ordnet die Anzeigen nebeneinander an (links nach rechts). Manuell: Du platzierst jede selbst — ein X/Y-Editor pro Anzeige erscheint im Abschnitt „Aktive Displays“ unten, sobald zwei oder mehr streamen.",
 	"display_layout_auto_row": "Automatisch (nebeneinander)",
 	"display_layout_manual": "Manuell",
 	"clients_title": "Gekoppelte Geräte",

web/messages/en.json

@@ -100,7 +100,7 @@
 	"display_identity_per_client": "Per client",
 	"display_identity_per_client_mode": "Per client + resolution",
 	"display_layout_mode": "Multi-monitor layout",
-	"display_layout_help": "How several displays are arranged on the desktop. Manual uses the arrangement table below (with 2+ displays).",
+	"display_layout_help": "Auto lays displays out side by side, left to right. Manual: you position each one yourself — a per-display X/Y editor appears in the Live displays section below once two or more are streaming.",
 	"display_layout_auto_row": "Auto (side by side)",
 	"display_layout_manual": "Manual",
 	"clients_title": "Paired clients",

web/src/sections/Displays/DisplayCard.tsx

@@ -1,6 +1,6 @@
 import { useQueryClient } from "@tanstack/react-query";
 import { Button } from "@unom/ui/button";
-import { type FC, useEffect, useState } from "react";
+import { type FC, type ReactNode, useEffect, useState } from "react";
 import {
 	getGetDisplayStateQueryKey,
 	getGetDisplaySettingsQueryKey,
@@ -210,8 +210,7 @@ const DisplayForm: FC<{
 			{/* Custom: every option by hand */}
 			{isCustom && (
 				<div className="space-y-6 rounded-lg border p-5">
-					<div className="space-y-2.5">
-						<Label>{m.display_keep_alive()}</Label>
+					<Field label={m.display_keep_alive()} help={m.display_keep_alive_help()}>
 						<div className="flex flex-wrap items-center gap-2">
 							<Button
 								size="sm"
@@ -251,8 +250,7 @@ const DisplayForm: FC<{
 								</div>
 							)}
 						</div>
-						<p className="text-xs text-muted-foreground">{m.display_keep_alive_help()}</p>
-					</div>
+					</Field>
 
 					<Choice
 						label={m.display_topology()}
@@ -296,10 +294,8 @@ const DisplayForm: FC<{
 						}
 					/>
 
-					<div className="space-y-2.5">
-						<Label htmlFor="disp-max">{m.display_max()}</Label>
+					<Field label={m.display_max()}>
 						<Input
-							id="disp-max"
 							type="number"
 							min={1}
 							max={16}
@@ -313,7 +309,7 @@ const DisplayForm: FC<{
 								})
 							}
 						/>
-					</div>
+					</Field>
 
 					<div className="border-t pt-4">
 						<Button onClick={() => apply(draft)} disabled={busy}>
@@ -340,7 +336,21 @@ const DisplayForm: FC<{
 	);
 };
 
-/** A labeled row of mutually-exclusive option buttons (topology / conflict / identity / layout). */
+/** A labeled config field — label, then the control, then optional help. The single source of the
+ * label→control→help spacing so every field (keep-alive, the button groups, max-displays) lines up. */
+const Field: FC<{ label: string; help?: string; children: ReactNode }> = ({
+	label,
+	help,
+	children,
+}) => (
+	<div className="space-y-3">
+		<Label className="block">{label}</Label>
+		{children}
+		{help && <p className="text-xs text-muted-foreground">{help}</p>}
+	</div>
+);
+
+/** A [`Field`] whose control is a row of mutually-exclusive option buttons (topology / conflict / …). */
 const Choice: FC<{
 	label: string;
 	help?: string;
@@ -350,8 +360,7 @@ const Choice: FC<{
 	disabled: boolean;
 	onPick: (v: string) => void;
 }> = ({ label, help, value, options, labels, disabled, onPick }) => (
-	<div className="space-y-2.5">
-		<Label>{label}</Label>
+	<Field label={label} help={help}>
 		<div className="flex flex-wrap gap-2">
 			{options.map((o) => (
 				<Button
@@ -365,8 +374,7 @@ const Choice: FC<{
 				</Button>
 			))}
 		</div>
-		{help && <p className="text-xs text-muted-foreground">{help}</p>}
-	</div>
+	</Field>
 );
 
 /**