One-shot bilingual intro paragraph with markdown + author avatar

- Admin can set a per-locale intro paragraph for the next issue on
  the preferences page; cleared automatically after a successful
  send. Stored in module_setting (longText) so multi-paragraph
  notes fit.
- Intro is rendered via webtrees' CommonMark factory (same flavour
  as notes) with raw HTML escaped, supports {{first_name}},
  {{last_name}}, {{username}}, {{email}} substitution per recipient.
- Two-column intro layout: tree contact user's linked Individual
  becomes the editorial portrait on the left. Their avatar is
  added to the per-recipient embed set so the inline image always
  resolves rather than falling through to a tree-page login link.
- Masthead now shows the tree URL under the title.
- Avatar source dimensions bumped 96→192 px and JPEG quality 75→88
  so portraits stay crisp at retina display ratios.

resources/views/email.phtml

@@ -5,8 +5,10 @@ declare(strict_types=1);
 use Fisharebest\Webtrees\Date;
 use Fisharebest\Webtrees\Fact;
 use Fisharebest\Webtrees\Family;
+use Fisharebest\Webtrees\Http\RequestHandlers\TreePage;
 use Fisharebest\Webtrees\I18N;
 use Fisharebest\Webtrees\Individual;
+use Fisharebest\Webtrees\Registry;
 use Fisharebest\Webtrees\Tree;
 use Illuminate\Support\Collection;
 
@@ -22,6 +24,8 @@ use Illuminate\Support\Collection;
  * @var array<string,string>          $relationships  xref => "your mother" etc. (per-recipient)
  * @var array<string,true>            $detailed_xrefs xref-set — render in detail; others as summary bullet
  * @var string                        $account_url
+ * @var string                        $intro          Admin-supplied one-shot intro paragraph; "" = skip block
+ * @var Individual|null               $intro_author   Tree contact's linked record, if any — avatar source for the intro
  */
 
 // ─── BockenTheme light-mode palette ─────────────────────────────────────
@@ -592,7 +596,20 @@ $timeline_arrow_row = '<tr>'
                         <h1 style="margin:10px 0 6px;font-weight:300;font-size:38px;line-height:1.1;letter-spacing:-0.015em;color:<?= $palette['ink'] ?>;">
                             <?= e($tree->title()) ?>
                         </h1>
-                        <div style="font-size:13px;font-weight:300;color:<?= $palette['ink3'] ?>;">
+                        <?php
+                            // Strip the leading scheme so the link
+                            // reads as a clean hostname/path — the
+                            // anchor still points at the absolute URL.
+                            $tree_url     = route(TreePage::class, ['tree' => $tree->name()]);
+                            $tree_url_lbl = preg_replace('~^https?://~i', '', rtrim($tree_url, '/'));
+                        ?>
+                        <div style="margin-top:4px;font-size:13px;font-weight:400;letter-spacing:0.01em;">
+                            <a href="<?= e($tree_url) ?>"
+                               style="color:<?= $palette['link'] ?>;text-decoration:none;border-bottom:1px solid <?= $palette['link'] ?>33;">
+                                <?= e($tree_url_lbl) ?>
+                            </a>
+                        </div>
+                        <div style="margin-top:6px;font-size:13px;font-weight:300;color:<?= $palette['ink3'] ?>;">
                             <?= e($masthead_date($generated_at)) ?>
                             <span style="color:<?= $palette['mute'] ?>;">·</span>
                             <?= e(I18N::translate('Events in the next %d days.', $window_days)) ?>
@@ -600,6 +617,40 @@ $timeline_arrow_row = '<tr>'
                     </td>
                 </tr>
 
+                <?php if (trim($intro) !== '') : ?>
+                    <!-- Editorial: one-shot intro paragraph ──────────── -->
+                    <?php
+                        // Render via webtrees' Markdown factory: CommonMark
+                        // with autolinks, the same flavour used elsewhere
+                        // in the site. Raw HTML in the source is escaped
+                        // by the factory's HtmlFilter::ESCAPE setting, so
+                        // a stray "<" can't break the email layout.
+                        $intro_html  = Registry::markdownFactory()->markdown(trim($intro), $tree);
+                        $intro_inner = '<div style="border-left:3px solid ' . $palette['accent'] . ';padding:6px 0 6px 16px;'
+                            . 'font-size:15px;line-height:1.55;font-weight:300;color:' . $palette['ink'] . ';'
+                            . 'font-style:italic;">' . $intro_html . '</div>';
+                    ?>
+                    <tr>
+                        <td style="padding:0 8px 24px;">
+                            <?php if ($intro_author instanceof Individual) : ?>
+                                <table role="presentation" cellpadding="0" cellspacing="0" border="0"
+                                       style="width:100%;border-collapse:collapse;">
+                                    <tr>
+                                        <td style="width:72px;vertical-align:top;padding-top:4px;">
+                                            <?= $avatar($intro_author) ?>
+                                        </td>
+                                        <td style="vertical-align:top;">
+                                            <?= $intro_inner ?>
+                                        </td>
+                                    </tr>
+                                </table>
+                            <?php else : ?>
+                                <?= $intro_inner ?>
+                            <?php endif ?>
+                        </td>
+                    </tr>
+                <?php endif ?>
+
                 <?php if (!$birthdays->isEmpty()) : ?>
                     <?php
                         $detailed = [];