Error tests, FK violations fix

- ErrorHandler tests: 77 assertions covering FK extraction, normalization, dedup, edge cases. Fix FK table map for child tables.
- Fix FK violation: (int)null → 0 in createThesis for orientation/ap/finality/license FK columns. Add FK value logging to updateThesis.
- Add CURRENT_ISSUES.md with summary of FK violation, dev debugging, and tag dedup status for next conversation

app/public/partage/index.php

@@ -49,6 +49,13 @@ if ($slug === 'licence-fragment' && $_SERVER['REQUEST_METHOD'] === 'POST') {
     exit;
 }
 
+// Special route: /partage/tag-search-fragment (HTMX fragment — interactive tag search)
+if ($slug === 'tag-search-fragment' && $_SERVER['REQUEST_METHOD'] === 'POST') {
+    App::boot();
+    require_once __DIR__ . '/tag-search-fragment.php';
+    exit;
+}
+
 // Special route: /partage/recapitulatif?id=N
 if ($slug === 'recapitulatif' || $slug === 'recapitulatif.php') {
     App::boot();
@@ -440,6 +447,7 @@ function handleShareLinkSubmission(string $slug): void
     require_once APP_ROOT . '/src/StudentEmail.php';
     require_once APP_ROOT . '/src/AppLogger.php';
     require_once APP_ROOT . '/src/DuplicateThesisException.php';
+    require_once APP_ROOT . '/src/ErrorHandler.php';
 
     $logger = new AppLogger();
     $authorName = $_POST['auteurice'] ?? 'unknown';
@@ -467,6 +475,7 @@ function handleShareLinkSubmission(string $slug): void
             $emailSent = StudentEmail::sendConfirmation(Database::getInstance(), $thesisId, $_POST);
             $_SESSION['share_email_sent'] = $emailSent;
         } catch (SmtpSendException $e) {
+            ErrorHandler::log('partage_smtp', $e, ['slug' => $slug, 'thesis_id' => $thesisId]);
             if ($e->isRecipientRejected()) {
                 $_SESSION['share_email_retry_thesis'] = $thesisId;
                 $_SESSION['share_email_retry_error']  = $e->smtpResponse;
@@ -485,8 +494,7 @@ function handleShareLinkSubmission(string $slug): void
         $logger->logDuplicate('partage', $authorName, $e->existingThesisId, $e->existingIdentifier, [
             'share_slug' => $slug,
         ]);
-
-        error_log('Share link duplicate submission: ' . $e->getMessage());
+        ErrorHandler::log('partage_duplicate', $e, ['slug' => $slug, 'author' => $authorName]);
 
         // Repopulate the form and surface a clear warning to the student.
         // Store as plain text — htmlspecialchars() is applied at render time.
@@ -505,10 +513,9 @@ function handleShareLinkSubmission(string $slug): void
             'author'     => $authorName,
             'post_keys'  => array_keys($_POST),
         ]);
+        ErrorHandler::log('partage_submit', $e, ['slug' => $slug, 'author' => $authorName]);
 
-        error_log('Share link submission error: ' . $e->getMessage());
-
-        $_SESSION['_flash_error'] = $e->getMessage();
+        $_SESSION['_flash_error'] = ErrorHandler::userMessage($e);
         $_SESSION['form_data_share_' . $slug] = $_POST;
         $_SESSION[$shareCsrfKey] = bin2hex(random_bytes(32)); // Regenerate token
 

app/public/partage/tag-search-fragment.php

@@ -0,0 +1,67 @@
+<?php
+/**
+ * tag-search-fragment.php
+ *
+ * Shared HTMX fragment: returns matching tag suggestions for the mot-clé
+ * interactive search input.
+ *
+ * Included by:
+ *   - /admin/tag-search-fragment.php  (AdminAuth gated)
+ *   - partage/index.php special route (public, session already booted)
+ *
+ * Expected POST:
+ *   q      — search query string (partial tag name)
+ *   tag[]  — already selected tag names (sent via hx-include, to exclude from suggestions)
+ */
+require_once __DIR__ . '/../../src/Database.php';
+
+$query = trim(preg_replace('/\s+/', ' ', strtolower($_POST['q'] ?? '')));
+$currentTags = isset($_POST['tag']) && is_array($_POST['tag'])
+    ? array_map(function($t) { return trim(preg_replace('/\s+/', ' ', strtolower($t))); }, $_POST['tag'])
+    : [];
+
+$db      = Database::getInstance();
+$results = $db->searchTags($query);
+
+// Deduplicate results by lowercase name
+$seen = [];
+$results = array_values(array_filter($results, function($tag) use (&$seen) {
+    $key = strtolower($tag['name']);
+    if (isset($seen[$key])) return false;
+    $seen[$key] = true;
+    return true;
+}));
+
+// Filter out already-selected tags (case-insensitive)
+$results = array_values(array_filter($results, function($tag) use ($currentTags) {
+    return !in_array(strtolower($tag['name']), $currentTags, true);
+}));
+
+// Check if query exactly matches an existing tag (case-insensitive)
+$exactExists = false;
+foreach ($results as $tag) {
+    if (strcasecmp($tag['name'], $query) === 0) {
+        $exactExists = true;
+        break;
+    }
+}
+
+// If no exact match and query non-empty, suggest creation
+$canCreate = ($query !== '' && !$exactExists && !in_array($query, $currentTags, true));
+?>
+<?php if (empty($results) && !$canCreate): ?>
+<div class="tag-search-empty">Aucun mot-clé trouvé.</div>
+<?php endif; ?>
+
+<?php foreach ($results as $tag): ?>
+<button type="button" class="tag-search-item" data-tag-id="<?= (int)$tag['id'] ?>" data-tag-name="<?= htmlspecialchars($tag['name']) ?>">
+    <span class="tag-search-item-name"><?= htmlspecialchars($tag['name']) ?></span>
+    <span class="tag-search-item-count">(<?= (int)$tag['thesis_count'] ?>)</span>
+</button>
+<?php endforeach; ?>
+
+<?php if ($canCreate): ?>
+<button type="button" class="tag-search-item tag-search-item--create" data-tag-name="<?= htmlspecialchars($query) ?>">
+    <span class="tag-search-item-name">Créer «&nbsp;<?= htmlspecialchars($query) ?>&nbsp;»</span>
+</button>
+<?php endif; ?>