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/public/assets/css/form-base.css

@@ -352,7 +352,11 @@
   border-radius: var(--radius);
 }
 
-.duration-time-inputs {
+.duration-field {
+  margin-bottom: var(--space-xs);
+}
+
+.duration-time-field {
   display: flex;
   align-items: flex-end;
   gap: var(--space-xs);
@@ -364,6 +368,11 @@
   gap: var(--space-3xs);
 }
 
+.duration-time-fields input[type="number"] {
+  width: 6ch;
+  min-width: 6ch;
+}
+
 .duration-time-fields span {
   font-size: var(--step--1);
   color: var(--text-secondary);