Add three icons, a styleable menu button and a reliable back-to-top in 1.13.0

The icon set had no drawing for people, music or a house - the three pictures
the Tagespflege Moldovan template asks for. They join as `people`, `music` and
`home`; a test keeps the list and the drawings together, because a missing path
renders an empty `<path d="">`: invisible, without an error.

An icon block's own colour never reached its drawing: the embedded SVG carries
the same `block-icon` class as its wrapper and set the accent colour again.
`.block-icon .block-icon{color:inherit}` fixes it at the root.

The menu button becomes a thing you can shape. `burgerLabel` chooses symbol and
text, text only or symbol only (which keeps the name for screen readers), and
the new style group `menu` targets the button itself, the way `img` targets an
image and `controls` the slider. Inside the header the opened menu now lies
under the header across the full width instead of pushing the header apart -
on a phone that looked like a missing navigation.

The back-to-top button no longer depends on `animation-timeline: scroll()`. A
browser that parses the property but does not run the timeline left it in the
first frame of the animation: permanently invisible. Two classes from
scrolled.js decide now, and without a script the button simply stays visible.

Also: the Tagespflege Moldovan rebuild as its own installation, built only by
`scripts/seed-tagespflege-moldovan.php`.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

src/Content/StyleSchema.php

@@ -206,6 +206,14 @@ final class StyleSchema
             'transition' => ['group' => 'effect', 'type' => 'number', 'css' => null, 'label' => 'Übergangsdauer (ms)', 'min' => 0, 'max' => 2000, 'step' => 25],
             // The slider controls are built by the script next to the slider, so their colours
             // travel as custom properties onto the slider and its controls (target "controls").
+            // Der Menü-Knopf ist ein eigener Knopf im Menüblock, kein eigener Baustein: seine
+            // Farben liegen deshalb auf dem Block und wirken auf das summary-Element darin.
+            'burgerColor' => ['group' => 'menu', 'type' => 'color', 'css' => 'color', 'label' => 'Menü-Knopf: Schrift und Striche', 'target' => 'burger'],
+            'burgerBackgroundColor' => ['group' => 'menu', 'type' => 'color', 'css' => 'background-color', 'label' => 'Menü-Knopf: Fläche', 'target' => 'burger'],
+            'burgerBorderColor' => ['group' => 'menu', 'type' => 'color', 'css' => 'border-color', 'label' => 'Menü-Knopf: Rahmen', 'target' => 'burger'],
+            'burgerBorderWidth' => ['group' => 'menu', 'type' => 'length', 'css' => 'border-width', 'label' => 'Menü-Knopf: Rahmenstärke', 'target' => 'burger'],
+            'burgerBorderRadius' => ['group' => 'menu', 'type' => 'length', 'css' => 'border-radius', 'label' => 'Menü-Knopf: Ecken', 'target' => 'burger'],
+            'burgerFontSize' => ['group' => 'menu', 'type' => 'length', 'css' => 'font-size', 'label' => 'Menü-Knopf: Schriftgröße', 'target' => 'burger'],
             'sliderDotColor' => ['group' => 'slider', 'type' => 'color', 'css' => '--slider-dot', 'label' => 'Punkte', 'target' => 'controls'],
             'sliderDotActiveColor' => ['group' => 'slider', 'type' => 'color', 'css' => '--slider-dot-active', 'label' => 'Aktiver Punkt', 'target' => 'controls'],
             'sliderControlColor' => ['group' => 'slider', 'type' => 'color', 'css' => '--slider-ink', 'label' => 'Pfeile und Zähler', 'target' => 'controls'],