Offer 98 icons in a dialog and style a button icon under Design

The icon set grows from 33 to 98 drawings in seven categories (arrows,
contact, commerce, files and media, people and security, house and trade,
general), including truck, cart, euro, camera, tools and solar. icons.js is
the single source; npm run build:icons writes the Twig drawings and the
validator list, and a test keeps them equal.

Choosing an icon no longer fills the panel with tiles: the panel shows the
current icon with "Change", which opens a modal with category tabs and named
tiles, keyboard navigable, closing with Escape. Button, icon and icon card
share it.

A new style group "Symbol" targets the icon inside a button per device and
on hover: colour, background, size, padding, radius, rotation, plus the gap
to the text. Schema v26 adds hover motion (slide, reveal) and an icon-only
button whose label stays as the accessible name and keeps the line height.
ADR 109.

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

src/Content/DocumentValidator.php

@@ -16,7 +16,7 @@ final class DocumentValidator
     /** Blocks introduced with schema v6 for the sections a marketing page actually needs. */
     public const V6_TYPES = ['iconcard', 'stat', 'quote', 'logos', 'cta', 'contact', 'divider', 'spacer', 'accordion', 'accordionitem'];
     /** Icons ship as inline SVG from this fixed list; no icon font and no external request. */
-    public const ICONS = ['app', 'web', 'design', 'network', 'hardware', 'shop', 'support', 'shield', 'clock', 'star', 'phone', 'mail', 'pin', 'check', 'people', 'music', 'home', 'arrow-right', 'arrow-left', 'arrow-up-right', 'arrow-down', 'chevron-right', 'calendar', 'chat', 'send', 'download', 'document', 'play', 'search', 'heart', 'info', 'plus', 'user'];
+    public const ICONS = ['arrow-up-right', 'arrow-right', 'arrow-left', 'arrow-up', 'arrow-down', 'chevron-right', 'chevron-left', 'chevron-up', 'chevron-down', 'arrow-circle', 'external', 'refresh', 'menu', 'close', 'plus', 'minus', 'phone', 'app', 'mail', 'chat', 'send', 'calendar', 'clock', 'pin', 'map', 'navigation', 'web', 'wifi', 'support', 'shop', 'cart', 'tag', 'euro', 'credit-card', 'gift', 'percent', 'truck', 'package', 'briefcase', 'document', 'download', 'upload', 'print', 'link', 'share', 'image', 'camera', 'video', 'play', 'pause', 'music', 'mic', 'book', 'user', 'people', 'login', 'lock', 'key', 'shield', 'eye', 'thumbs-up', 'award', 'graduation', 'heart', 'star', 'home', 'building', 'wrench', 'hammer', 'brush', 'ruler', 'leaf', 'tree', 'sun', 'droplet', 'flame', 'bolt', 'solar', 'thermometer', 'snowflake', 'car', 'check', 'check-circle', 'info', 'help', 'alert', 'search', 'settings', 'filter', 'grid', 'list', 'sparkle', 'coffee', 'utensils', 'laptop', 'hardware', 'network', 'design'];
     /** Das Symbol eines Buttons, wenn keins gewählt ist: der Pfeil, den jeder Button vor v25 hatte. */
     public const BUTTON_DEFAULT_ICON = 'arrow-up-right';
     public const SPACER_SIZES = ['small', 'medium', 'large', 'huge'];
@@ -42,7 +42,7 @@ final class DocumentValidator
     public const V23_TYPES = ['social'];
     public const V24_TYPES = ['html'];
     /** Die aktuelle Fassung des Dokumentschemas - dieselbe Zahl wie SCHEMA_VERSION in editor-model.js. */
-    public const SCHEMA_VERSION = 25;
+    public const SCHEMA_VERSION = 26;
 
     /**
      * @param bool $requireHeading A page needs exactly one main heading. A header, a footer or a
@@ -247,6 +247,16 @@ final class DocumentValidator
             if (array_key_exists('iconPosition', $props)) {
                 $this->require($schemaVersion >= 25 && in_array($props['iconPosition'], ['start', 'end'], true), 'Das Symbol steht vor oder nach dem Text und braucht Schema v25.');
             }
+            // Schema v26 (ADR 109): was das Symbol beim Überfahren tut, und ein Button nur aus
+            // Symbol. Der Text bleibt dann für Vorlesesoftware da - ohne Symbol wäre der Button
+            // unsichtbar, deshalb braucht "nur Symbol" ein Symbol.
+            if (array_key_exists('iconMotion', $props)) {
+                $this->require($schemaVersion >= 26 && in_array($props['iconMotion'], ['none', 'slide', 'reveal'], true), 'Unbekannte Bewegung des Symbols oder Dokumentschema vor v26.');
+            }
+            if (array_key_exists('iconOnly', $props)) {
+                $this->require($schemaVersion >= 26 && is_bool($props['iconOnly']), 'Nur Symbol ist an oder aus und braucht Schema v26.');
+                $this->require(!$props['iconOnly'] || 'none' !== ($props['icon'] ?? self::BUTTON_DEFAULT_ICON), 'Ein Button nur aus Symbol braucht ein Symbol.');
+            }
         }
         if ('iconcard' === $type) {
             $this->require(in_array($props['icon'] ?? null, self::ICONS, true), 'Unknown icon.');