refactor: combined duration (pages + minutes), has_annexes checkbox, remove Mo

- Remove Mo option from duration, keep only pages and minutes
- Redesign duration fieldset: separate Pages input + Durée h:m inputs, both can be set together
- Fix minutes input visibility: wider inputs (6ch), proper CSS layout
- Add has_annexes checkbox to fichiers fragment + DB column + controllers
- Display duration on admin backoffice recap page
- Display duration on public partage recap page
- Update public TFE page for new combined duration format
- Migration 041: add duration_pages, duration_minutes, has_annexes columns; migrate data; recreate views

app/templates/partials/form/fichiers-fragment.php

@@ -185,9 +185,15 @@ $websiteLabel = htmlspecialchars($_POST['website_label'] ?? '');
 
     <!-- ── 4. Annexes ── -->
     <div id="annexes-input-block">
-        <input type="hidden" name="has_annexes" value="0">
+        <div class="admin-form-group">
+            <label class="admin-checkbox-label">
+                <input type="checkbox" name="has_annexes" value="1"
+                       <?= !empty($_POST['has_annexes']) ? 'checked' : '' ?>>
+                Ce TFE contient des annexes
+            </label>
+        </div>
         <div class="admin-form-group admin-files-fieldgroup">
-            <label for="annexe-files-input">Annexes (optionnel)</label>
+            <label for="annexe-files-input">Fichiers annexes (optionnel)</label>
             <div class="admin-file-input">
                 <input type="file" id="annexe-files-input"
                        name="queue_file[annexe][]"