feat : barre de partage articles + déduplication images uploadées (v1.6.20)

- post_view.php : barre de partage (mail, X, LinkedIn, Mastodon, copier, Web Share) sur articles publiés (#47)
- share.js : logique clipboard + navigator.share sans script tiers, compatible CSP (#47)
- addFile() : hardlink vers fichier identique si même hash16-size.ext dans un autre article (#35)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

templates/layout.php

@@ -163,6 +163,9 @@ $_layoutCurrentCat = trim($_GET['cat'] ?? '');
 <?php if (isset($reactionStats)): ?>
 <script src="<?= _av($_pub, 'js/reactions.js') ?>"></script>
 <?php endif; ?>
+<?php if (!empty($shareBar ?? false)): ?>
+<script src="<?= _av($_pub, 'js/share.js') ?>" defer></script>
+<?php endif; ?>
 
 </body>
 </html>

templates/post_view.php

@@ -261,6 +261,28 @@ $hasSources     = (!empty($externalLinks) || !empty($files))
     </div>
 </div>
 
+<?php if ($article['published'] ?? false): ?>
+<?php
+$_shareUrl   = rtrim(defined('APP_URL') ? APP_URL : '', '/') . '/post/' . rawurlencode($article['slug'] ?? '');
+$_shareTitle = $article['title'] ?? '';
+?>
+<div class="d-flex flex-wrap align-items-center gap-2 my-3 py-2 border-top"
+     id="share-bar"
+     data-url="<?= htmlspecialchars($_shareUrl) ?>"
+     data-title="<?= htmlspecialchars($_shareTitle) ?>">
+    <span class="text-muted small me-1">Partager :</span>
+    <a href="mailto:?subject=<?= rawurlencode($_shareTitle) ?>&amp;body=<?= rawurlencode($_shareUrl) ?>"
+       class="btn btn-outline-secondary btn-sm" title="Par e-mail">✉ Mail</a>
+    <a href="https://x.com/intent/tweet?text=<?= rawurlencode($_shareTitle) ?>&amp;url=<?= rawurlencode($_shareUrl) ?>"
+       class="btn btn-outline-secondary btn-sm" target="_blank" rel="noopener noreferrer" title="X / Twitter">X</a>
+    <a href="https://www.linkedin.com/sharing/share-offsite/?url=<?= rawurlencode($_shareUrl) ?>"
+       class="btn btn-outline-secondary btn-sm" target="_blank" rel="noopener noreferrer" title="LinkedIn">in</a>
+    <a href="https://mastodon.social/share?text=<?= rawurlencode($_shareTitle . ' ' . $_shareUrl) ?>"
+       class="btn btn-outline-secondary btn-sm" target="_blank" rel="noopener noreferrer" title="Mastodon">🐘</a>
+    <button type="button" class="btn btn-outline-secondary btn-sm" id="share-copy">Copier le lien</button>
+    <button type="button" class="btn btn-outline-primary btn-sm" id="share-native" hidden>⬆ Partager</button>
+</div>
+<?php endif; ?>
 
 <?php include __DIR__ . '/comments_section.php'; ?>
 
@@ -397,6 +419,7 @@ $hasSources     = (!empty($externalLinks) || !empty($files))
 
 <?php
 $content            = ob_get_clean();
+$shareBar           = (bool)($article['published'] ?? false);
 $title              = htmlspecialchars($article['title']);
 $seoTitle           = ($article['seo_title'] ?? '') ?: $article['title'];
 $ogType             = 'article';