Add social profiles as a block and rebuild Elektro Bernhard in 1.12.0

Social profiles are maintained once under settings (one HTTPS address per
network, SocialProfiles::NETWORKS) and shown by the new `social` block
(document schema v23) wherever it stands: size, shape, layout, labels,
new tab and an optional subset of networks on the block; colour, hover,
spacing and alignment through the free block styles. The addresses also
feed sameAs in the structured data. Icons are own outline drawings in
the style of the existing icon set. ADR 093.

Elektro Bernhard is rebuilt with a dark hero over the team photo, a
transparent header that turns white on scroll, Lato, cards with shadows
and hover lift, a review slider with six real Google reviews, a dark
solar band, page headers on every subpage and staggered entrance
effects. Social profiles sit in the top bar and the footer. The site is
a second local reference installation next to the Kant-IT pilot
(var/elektro-bernhard.db, launch config on port 8088); the seed script
rebuilds it from scratch.

Checked: PHP suite 492 tests (only the documented old failure remains),
33 JS tests, Twig lint, PHP style, full editor browser check with axe.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

templates/admin/settings.html.twig

@@ -95,7 +95,19 @@
         <input id="description" name="description" maxlength="300" value="{{ settings.description }}">
         <label for="sameAs">Profile</label>
         <textarea id="sameAs" name="sameAs" rows="3" placeholder="https://www.linkedin.com/company/…">{{ settings.sameAs|join('\n') }}</textarea>
-        <p class="field-help">Eine HTTPS-Adresse je Zeile, höchstens zwanzig.</p>
+        <p class="field-help">Eine HTTPS-Adresse je Zeile, höchstens zwanzig. Die sozialen Profile unten stehen automatisch mit in den strukturierten Daten.</p>
+        <fieldset class="field-set">
+            <legend>Soziale Profile</legend>
+            <p class="field-help">Einmal hier eintragen, dann mit dem Element „Soziale Profile“ an jeder Stelle einsetzen – im Kopf, im Fuß, in einer Kontaktsektion. Größe, Form und Farbe bestimmt das Element. Leere Felder erscheinen nicht.</p>
+            <div class="fields">
+                {% for key, name in socialNetworks %}
+                <div>
+                    <label for="social-{{ key }}">{{ name }}</label>
+                    <input id="social-{{ key }}" name="social[{{ key }}]" type="url" maxlength="400" value="{{ settings.social[key]|default('') }}" placeholder="{{ socialPlaceholders[key] }}">
+                </div>
+                {% endfor %}
+            </div>
+        </fieldset>
         <label class="check-label" for="localBusiness"><input id="localBusiness" name="localBusiness" type="checkbox" value="1"{{ settings.localBusiness ? ' checked' : '' }}> Als lokales Unternehmen auszeichnen</label>
         <p class="field-help">Braucht mindestens Straße und Ort. Sinnvoll bei einem Standort mit Kundenverkehr.</p>
         <label class="check-label" for="llmsTxt"><input id="llmsTxt" name="llmsTxt" type="checkbox" value="1"{{ settings.llmsTxt ? ' checked' : '' }}> <code>llms.txt</code> ausliefern</label>