fix: duplicate warning not shown in admin, double-encoded in partage, no focus

- toast-fragment.php: 204 early-exit now also checks flash['warning'];
  previously the warning was consumed by consumeFlash() then silently dropped
- partage/index.php: store warning as plain text; htmlspecialchars() applied
  once at render time — previously htmlspecialchars() was called inside the
  stored string then again at output, producing ' entities etc.
- partage/index.php: flash-warning div gets id + tabindex=-1; inline JS
  scrolls it into view and focuses it on DOMContentLoaded
- admin/footer.php: htmx:afterSettle listener focuses .toast--warning after
  HTMX injects the toast fragment into #toast-region

TODO.md

@@ -1,6 +1,6 @@
 # XAMXAM TODO
 
-## Duplicate TFE submission prevention
+## Duplicate TFE submission prevention (fixes)
 - [x] `DuplicateThesisException` — typed exception carrying existing thesis metadata
 - [x] `Database::findDuplicateThesis()` — year + author + normalised-title matching (exact, prefix, Levenshtein ≤10%)
 - [x] `ThesisCreateController::submit()` — calls duplicate check before any DB write, throws `DuplicateThesisException`
@@ -11,3 +11,9 @@
 - [x] `toast.php` — renders `toast--warning` block
 - [x] `admin.css` — `.toast--warning` style + link colour
 - [x] `form.css` — `.flash-warning` style (partage form)
+
+## Duplicate warning display fixes
+- [x] `toast-fragment.php` — 204 guard now also checks `warning`; warning was silently discarded before
+- [x] `partage/index.php` — warning stored as plain text (no pre-escaping); `htmlspecialchars()` applied once at render; was double-encoded before
+- [x] `partage/index.php` — `flash-warning` div gets `id` + `tabindex=-1`; inline JS scrolls and focuses it on load
+- [x] `admin/footer.php` — `htmx:afterSettle` listener focuses `.toast--warning` after HTMX injects the toast fragment

app/public/admin/actions/formulaire.php

@@ -13,7 +13,7 @@ AdminAuth::requireLogin();
 if (!isset($_POST['csrf_token'], $_SESSION['csrf_token'])
     || !hash_equals($_SESSION['csrf_token'], $_POST['csrf_token'])) {
     error_log(sprintf(
-        'CSRF token validation failed in formulaire.php — POST token: %s, SESSION token: %s',
+        'CSRF token validation failed in formulaire.php - POST token: %s, SESSION token: %s',
         $_POST['csrf_token'] ?? '(missing)',
         $_SESSION['csrf_token'] ?? '(missing)'
     ));
@@ -49,10 +49,10 @@ try {
 
     // Build a warning with a clickable link to the existing thesis.
     $existingUrl  = htmlspecialchars('/admin/edit.php?id=' . $e->existingThesisId);
-    $existingRef  = htmlspecialchars($e->existingIdentifier . ' — ' . $e->existingTitle . ' (' . $e->existingYear . ')');
+    $existingRef  = htmlspecialchars($e->existingIdentifier . ' - ' . $e->existingTitle . ' (' . $e->existingYear . ')');
-    $warningHtml  = 'Doublon détecté : un TFE très similaire existe déjà. '
+    $warningHtml  = 'Doublon détecté : un TFE très similaire existe déjà.'
-                  . '<a href="' . $existingUrl . '" style="color:inherit;text-decoration:underline">' . $existingRef . '</a>'
+                  . '<br><a href="' . $existingUrl . '">' . $existingRef . '</a>'
-                  . ' Vérifiez avant de soumettre à nouveau.';
+                  . '<br>Vérifiez avant de soumettre à nouveau.';
 
     App::flash('warning', $warningHtml);
     $_SESSION['form_data'] = $_POST;

app/public/admin/toast-fragment.php

@@ -13,7 +13,7 @@ AdminAuth::requireLogin();
 
 $flash = App::consumeFlash();
 
-if (!$flash['error'] && !$flash['success']) {
+if (!$flash['error'] && !$flash['success'] && !$flash['warning']) {
     http_response_code(204);
     exit;
 }

app/public/assets/css/admin.css

@@ -186,6 +186,7 @@
     background: var(--bg-secondary);
     border-color: var(--warning);
     color: var(--text-primary);
+    animation: toast-enter 0.35s ease-out; /* no fade-out — stays until dismissed */
 }
 
 .toast--warning a {

app/public/assets/css/form.css

@@ -360,6 +360,7 @@ label:has(+ div > input:required)::after {
     background: var(--warning-muted-bg, rgba(251,202,81,.12));
     border-color: var(--warning-muted-border, rgba(251,202,81,.35));
     color: var(--text-primary);
+    white-space: pre-line;
 }
 
 /* ── Share link badge ───────────────────────────────────────────────────── */

app/public/partage/index.php

@@ -1,11 +1,11 @@
 <?php
 /**
- * Partage — Entry point for shared student submission forms.
+ * Partage - Entry point for shared student submission forms.
  *
  * Routes:
- *   /partage/<slug>          — Render the share-link form (or password gate)
+ *   /partage/<slug>          - Render the share-link form (or password gate)
- *   /partage/<slug>/submit    — POST endpoint for form submissions via share link
+ *   /partage/<slug>/submit    - POST endpoint for form submissions via share link
- *   /partage/recapitulatif.php?id=N — Post-submission confirmation page
+ *   /partage/recapitulatif.php?id=N - Post-submission confirmation page
  */
 require_once __DIR__ . '/../../bootstrap.php';
 
@@ -83,7 +83,7 @@ if (!$validationResult['valid']) {
     exit;
 }
 
-// Link is valid — render the form
+// Link is valid - render the form
 $link = $validationResult['link'];
 renderShareLinkForm($slug, $link);
 
@@ -222,7 +222,7 @@ function renderShareLinkForm(string $slug, array $link): void
 
     // Build old()-compatible callable from $formData (share forms use the array variant).
     $shareOldFn = fn(string $key, string $default = '') => old($formData, $key, $default);
-    // No autofocus in the share form — identity function.
+    // No autofocus in the share form - identity function.
     $shareWithAutofocusFn = fn(string $field, array $attrs = []) => $attrs;
 
     // Load all form help blocks in one query.
@@ -267,7 +267,8 @@ function renderShareLinkForm(string $slug, array $link): void
             <div class="flash-error" role="alert"><?= htmlspecialchars($flashError) ?></div>
             <?php endif; ?>
             <?php if ($flashWarning): ?>
-            <div class="flash-warning" role="alert"><?= htmlspecialchars($flashWarning) ?></div>
+            <div class="flash-warning" id="flash-warning" role="alert" tabindex="-1"><?= htmlspecialchars($flashWarning) ?></div>
+            <script>document.addEventListener('DOMContentLoaded',function(){var el=document.getElementById('flash-warning');if(el){el.scrollIntoView({behavior:'smooth',block:'center'});el.focus();}});</script>
             <?php endif; ?>
             <?php if ($flashSuccess): ?>
             <div class="flash-success" role="alert"><?= htmlspecialchars($flashSuccess) ?></div>
@@ -460,7 +461,7 @@ function handleShareLinkSubmission(string $slug): void
         unset($_SESSION[$shareCsrfKey]);
         unset($_SESSION['share_verified_' . $slug]);
 
-        // Send confirmation e-mail — on delivery failure, redirect to retry page
+        // Send confirmation e-mail - on delivery failure, redirect to retry page
         $emailError = null;
         try {
             $emailSent = StudentEmail::sendConfirmation(Database::getInstance(), $thesisId, $_POST);
@@ -472,7 +473,7 @@ function handleShareLinkSubmission(string $slug): void
                 header('Location: /partage/retry-email?id=' . urlencode((string)$thesisId));
                 exit();
             }
-            // Non-recipient errors (relay down, etc.) — skip email silently
+            // Non-recipient errors (relay down, etc.) - skip email silently
             $_SESSION['share_email_sent'] = false;
         }
 
@@ -488,9 +489,10 @@ function handleShareLinkSubmission(string $slug): void
         error_log('Share link duplicate submission: ' . $e->getMessage());
 
         // Repopulate the form and surface a clear warning to the student.
-        $_SESSION['_flash_warning'] = 'Votre soumission ressemble à un TFE déjà enregistré ('
+        // Store as plain text — htmlspecialchars() is applied at render time.
-            . htmlspecialchars($e->existingIdentifier . ' — ' . $e->existingTitle . ', ' . $e->existingYear)
+        $_SESSION['_flash_warning'] = 'Votre soumission ressemble à un TFE déjà enregistré.'
-            . '). Si vous pensez qu’il s’agit d’une erreur, veuillez contacter l’équipe.';
+            . "\n" . $e->existingIdentifier . ' — ' . $e->existingTitle . ' (' . $e->existingYear . ')'
+            . "\nSi vous pensez qu'il s'agit d'une erreur, veuillez contacter l'équipe.";
         $_SESSION['form_data_share_' . $slug] = $_POST;
         $_SESSION[$shareCsrfKey] = bin2hex(random_bytes(32)); // Regenerate token
 

app/storage/logs/form-submissions.log

@@ -9,3 +9,8 @@
 {"source":"partage","action":"submit","status":"success","thesis_id":23,"identifier":"2025-020","author":"Zoé Lambert","share_slug":"20260429-DZESJT6X","timestamp":"2026-04-30T11:46:49+00:00","ip":"127.0.0.1","user_agent":"Mozilla/5.0 (X11; Linux x86_64; rv:150.0) Gecko/20100101 Firefox/150.0"}
 {"source":"partage","action":"submit","status":"success","thesis_id":24,"identifier":"2025-021","author":"Emma Renard","share_slug":"20260429-DZESJT6X","timestamp":"2026-04-30T11:49:49+00:00","ip":"127.0.0.1","user_agent":"Mozilla/5.0 (X11; Linux x86_64; rv:150.0) Gecko/20100101 Firefox/150.0"}
 {"source":"partage","action":"submit","status":"success","thesis_id":25,"identifier":"2025-001","author":"Emma Renard","share_slug":"20260429-DZESJT6X","timestamp":"2026-04-30T12:17:35+00:00","ip":"127.0.0.1","user_agent":"Mozilla/5.0 (X11; Linux x86_64; rv:150.0) Gecko/20100101 Firefox/150.0"}
+{"source":"admin","action":"submit","status":"success","thesis_id":37,"identifier":"2025-012","author":"Théo Marchand","timestamp":"2026-05-04T14:56:37+00:00","ip":"127.0.0.1","user_agent":"Mozilla/5.0 (X11; Linux x86_64; rv:150.0) Gecko/20100101 Firefox/150.0"}
+{"source":"admin","action":"submit","status":"duplicate","author":"Théo Marchand","existing_thesis_id":37,"existing_identifier":"2025-012","timestamp":"2026-05-04T14:56:53+00:00","ip":"127.0.0.1","user_agent":"Mozilla/5.0 (X11; Linux x86_64; rv:150.0) Gecko/20100101 Firefox/150.0"}
+{"source":"partage","action":"submit","status":"duplicate","author":"Théo Marchand","existing_thesis_id":37,"existing_identifier":"2025-012","share_slug":"20260429-DZESJT6X","timestamp":"2026-05-04T15:01:08+00:00","ip":"127.0.0.1","user_agent":"Mozilla/5.0 (X11; Linux x86_64; rv:150.0) Gecko/20100101 Firefox/150.0"}
+{"source":"partage","action":"submit","status":"duplicate","author":"Théo Marchand","existing_thesis_id":37,"existing_identifier":"2025-012","share_slug":"20260429-DZESJT6X","timestamp":"2026-05-04T15:05:04+00:00","ip":"127.0.0.1","user_agent":"Mozilla/5.0 (X11; Linux x86_64; rv:150.0) Gecko/20100101 Firefox/150.0"}
+{"source":"admin","action":"submit","status":"duplicate","author":"Théo Marchand","existing_thesis_id":37,"existing_identifier":"2025-012","timestamp":"2026-05-04T15:05:31+00:00","ip":"127.0.0.1","user_agent":"Mozilla/5.0 (X11; Linux x86_64; rv:150.0) Gecko/20100101 Firefox/150.0"}

app/templates/admin/footer.php

@@ -14,5 +14,13 @@
 <script><?= $extraJsInline ?></script>
 <?php endif; ?>
 <script src="/assets/js/htmx.min.js"></script>
+<script>
+document.body.addEventListener('htmx:afterSettle', function (e) {
+    if (e.target && e.target.id === 'toast-region') {
+        var warn = e.target.querySelector('.toast--warning');
+        if (warn) { warn.setAttribute('tabindex', '-1'); warn.focus(); }
+    }
+});
+</script>
 </body>
 </html>