feat: Settings uses the width of a wide screen: groups sit in two columns, each narrow enough that a row's control stays near its name (M503 #5595)

The content was capped at max-w-3xl, so a wide window showed one narrow
strip and a lot of empty space. SettingsColumns lays a page's groups out as
one column on a phone or narrow window and two side by side from xl up;
the page cap moves to 100rem so the columns don't stretch on a very wide
screen.

- Account: Android app, Profile and Password, with Signed-in devices beside.
- Playback: "Between tracks" (crossfade) beside "Volume leveling".
- Connections: ListenBrainz beside Subsonic apps.
- Appearance, Notifications, About: one column's width.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

web/src/lib/components/settings/SettingsColumns.svelte

@@ -0,0 +1,24 @@
+<script lang="ts">
+  import type { Snippet } from 'svelte';
+
+  // A settings page's groups laid out for the width it has (#5595 follow-up):
+  // one column on a phone or a narrow window, two side by side on a wide
+  // screen, so a wide window shows more at once instead of one narrow strip
+  // with empty space beside it. Each column stays narrow enough that a row's
+  // control sits near its name. `main` holds the groups read first; `side`
+  // the ones beside them (signed-in devices beside the profile, say). A
+  // page with only `main` keeps its groups to one column's width.
+
+  let { main, side }: { main: Snippet; side?: Snippet } = $props();
+</script>
+
+<div class="grid items-start gap-6 xl:grid-cols-2">
+  <div class="min-w-0 space-y-6">
+    {@render main()}
+  </div>
+  {#if side}
+    <div class="min-w-0 space-y-6">
+      {@render side()}
+    </div>
+  {/if}
+</div>

web/src/lib/components/settings/SettingsColumns.test.ts

@@ -0,0 +1,21 @@
+import { describe, expect, test } from 'vitest';
+import { render, screen } from '@testing-library/svelte';
+import { createRawSnippet } from 'svelte';
+import SettingsColumns from './SettingsColumns.svelte';
+
+const snip = (id: string) => createRawSnippet(() => ({ render: () => `<section data-testid="${id}"></section>` }));
+
+describe('SettingsColumns', () => {
+  test('main and side are two columns that sit side by side on a wide screen', () => {
+    render(SettingsColumns, { main: snip('main'), side: snip('side') });
+    const grid = screen.getByTestId('main').parentElement!.parentElement!;
+    expect(grid.className).toMatch(/xl:grid-cols-2/);
+    expect(grid.children).toHaveLength(2);
+    expect(screen.getByTestId('side').parentElement!.parentElement).toBe(grid);
+  });
+
+  test('with only main, the groups keep to one column', () => {
+    render(SettingsColumns, { main: snip('only') });
+    expect(screen.getByTestId('only').parentElement!.parentElement!.children).toHaveLength(1);
+  });
+});

web/src/routes/settings/+layout.svelte

@@ -24,8 +24,10 @@
         <SectionRail label="Settings sections" {items} />
       </div>
     </div>
-    <!-- Capped so a row's control sits near its name on a wide screen. -->
+    <!-- Each page lays its groups out in SettingsColumns: two columns on a
-    <div class="min-w-0 max-w-3xl space-y-6">
+         wide screen, each narrow enough that a row's control sits near its
+         name. The cap only stops the columns stretching on a very wide one. -->
+    <div class="min-w-0 max-w-[100rem] space-y-6">
       {@render children?.()}
     </div>
   </div>

web/src/routes/settings/about/+page.svelte

@@ -1,4 +1,5 @@
 <script lang="ts">
+  import SettingsColumns from '#lib/components/settings/SettingsColumns.svelte';
   import { pageTitle } from '#lib/branding.js';
   import { user } from '#lib/auth/user.svelte.js';
   import ServerVersion from '#lib/components/ServerVersion.svelte';
@@ -8,6 +9,8 @@
 
 <svelte:head><title>{pageTitle('Settings · About')}</title></svelte:head>
 
+<SettingsColumns>
+  {#snippet main()}
     <SettingsGroup title="About">
       <SettingRow label="Server version">
         <ServerVersion />
@@ -18,3 +21,5 @@
         </SettingRow>
       {/if}
     </SettingsGroup>
+  {/snippet}
+</SettingsColumns>

web/src/routes/settings/account/+page.svelte

@@ -1,4 +1,5 @@
 <script lang="ts">
+  import SettingsColumns from '#lib/components/settings/SettingsColumns.svelte';
   import { onMount } from 'svelte';
   import { useQueryClient } from '@tanstack/svelte-query';
   import { pageTitle } from '#lib/branding.js';
@@ -103,6 +104,8 @@
 
 <svelte:head><title>{pageTitle('Settings · Account')}</title></svelte:head>
 
+<SettingsColumns>
+  {#snippet main()}
     <MobileAppDownload />
 
     <form onsubmit={onSaveProfile}>
@@ -187,5 +190,8 @@
         </div>
       </SettingsGroup>
     </form>
-
+  {/snippet}
+  {#snippet side()}
     <ActiveSessions />
+  {/snippet}
+</SettingsColumns>

web/src/routes/settings/appearance/+page.svelte

@@ -1,4 +1,5 @@
 <script lang="ts">
+  import SettingsColumns from '#lib/components/settings/SettingsColumns.svelte';
   import { pageTitle } from '#lib/branding.js';
   import { theme, setTheme, type ThemePreference } from '#lib/stores/theme.svelte.js';
   import SettingsGroup from '#lib/components/settings/SettingsGroup.svelte';
@@ -14,8 +15,12 @@
 
 <svelte:head><title>{pageTitle('Settings · Appearance')}</title></svelte:head>
 
+<SettingsColumns>
+  {#snippet main()}
     <SettingsGroup title="Appearance">
       <SettingRow label="Theme" hint="System follows your device's light or dark setting.">
         <Segmented name="theme" label="Theme" options={themes} value={theme.value} onchange={setTheme} />
       </SettingRow>
     </SettingsGroup>
+  {/snippet}
+</SettingsColumns>

web/src/routes/settings/connections/+page.svelte

@@ -1,4 +1,5 @@
 <script lang="ts">
+  import SettingsColumns from '#lib/components/settings/SettingsColumns.svelte';
   import { onMount } from 'svelte';
   import { useQueryClient } from '@tanstack/svelte-query';
   import type { CreateQueryResult } from '@tanstack/svelte-query';
@@ -170,6 +171,8 @@
   </div>
 {/snippet}
 
+<SettingsColumns>
+  {#snippet main()}
     <SettingsGroup title="ListenBrainz" hint="Sends what you play to your ListenBrainz profile.">
       {#if $status.isPending}
         <div class="px-4 py-3 text-sm text-text-secondary">Loading…</div>
@@ -225,7 +228,8 @@
         </SettingRow>
       {/if}
     </SettingsGroup>
-
+  {/snippet}
+  {#snippet side()}
     <SettingsGroup title="Subsonic apps" hint="How third-party Subsonic apps sign in as you.">
       <SettingRow label="API token" hint="For apps that sign in with an API key. Use this where you can.">
         <button type="button" disabled={tokenSaving} onclick={onRegenerateToken} class={button}>
@@ -258,3 +262,5 @@
         {@render secret(subsonicPassword, 'Subsonic password')}
       {/if}
     </SettingsGroup>
+  {/snippet}
+</SettingsColumns>

web/src/routes/settings/notifications/+page.svelte

@@ -1,8 +1,13 @@
 <script lang="ts">
+  import SettingsColumns from '#lib/components/settings/SettingsColumns.svelte';
   import { pageTitle } from '#lib/branding.js';
   import NotificationSettings from '#lib/components/NotificationSettings.svelte';
 </script>
 
 <svelte:head><title>{pageTitle('Settings · Notifications')}</title></svelte:head>
 
+<SettingsColumns>
+  {#snippet main()}
     <NotificationSettings />
+  {/snippet}
+</SettingsColumns>

web/src/routes/settings/playback/+page.svelte

@@ -1,4 +1,5 @@
 <script lang="ts">
+  import SettingsColumns from '#lib/components/settings/SettingsColumns.svelte';
   import { pageTitle } from '#lib/branding.js';
   import { player, setCrossfade } from '#lib/player/store.svelte.js';
   import NormalizationSetting from '#lib/components/NormalizationSetting.svelte';
@@ -8,7 +9,9 @@
 
 <svelte:head><title>{pageTitle('Settings · Playback')}</title></svelte:head>
 
-<SettingsGroup title="Playback">
+<SettingsColumns>
+  {#snippet main()}
+    <SettingsGroup title="Between tracks">
       <SettingRow
         label="Crossfade"
         hint="Fades one track into the next. Most albums sound best with it off."
@@ -28,5 +31,11 @@
           {player.crossfadeSec === 0 ? 'Off' : `${player.crossfadeSec}s`}
         </span>
       </SettingRow>
+    </SettingsGroup>
+  {/snippet}
+  {#snippet side()}
+    <SettingsGroup title="Volume leveling" hint="Evens out loudness between tracks and albums.">
       <NormalizationSetting />
     </SettingsGroup>
+  {/snippet}
+</SettingsColumns>