feat: fix file deletion on save + trash policy + documents/ prefix + relink browser

1. note_intention: Delete old file only when a genuinely new upload arrives
   (32-char hex file_id), not when the FilePond pool preserves an existing
   file by sending its DB integer ID.  Previously the DB integer ID
   triggered $hasNewNote=true, which deleted the existing note_intention
   from disk+DB, then handleFilePondSingleFile couldn't re-process it
   because the regex requires a hex pattern.  Same fix applied to cover.

2. All file deletions now use deleteThesisFileToTrash() which renames
   files to tmp/_trash/ instead of unlinking.  The trash preserves
   original filenames prefixed with DB id for traceability.  Skips
   website URLs and PeerTube refs (no disk file).

3. Storage prefix changed from theses/ to documents/ to reflect that
   the folder holds all document types (determined by file_type in DB).
   MediaController visibility gate supports both prefixes for backward
   compat with existing files.

4. File browser + relink feature for orphaned files:
   - /admin/fragments/file-browser.php — HTMX tree browser for
     storage/documents/ and storage/theses/
   - /admin/actions/filepond/relink.php — POST endpoint that inserts
     a thesis_files row pointing to existing on-disk file
   - Per-pool "📂 Relier" buttons (edit mode only)
   - JS: XamxamOpenFileBrowser / XamxamRelinkFile with FilePond integration
   - CSS: .relink-modal dialog + .file-browser tree styles

app/templates/partials/form/jury-fieldset.php

@@ -67,13 +67,13 @@ if ($addMode) {
     <legend>Composition du jury</legend>
 
     <!-- Promoteur·ice(s) interne -->
-    <fieldset class="admin-jury-lecteurs">
+    <fieldset class="admin-jury-lecteurs" data-jury-autocomplete data-jury-hx-post="<?= $adminMode ? '/admin/fragments/pill-search.php' : '/partage/fragments/pill-search.php' ?>" data-jury-role="promoteur_interne">
         <legend>Promoteur·ice(s) interne<?= $adminMode ? '' : ' <span class="asterisk">*</span>' ?></legend>
         <div id="jury-promoteur-interne-list" class="admin-jury-list">
             <?php if (empty($juryPromoteurs) && $juryPromoteur === null): ?>
             <div class="admin-jury-entry">
                 <input type="text" name="jury_promoteur[]" placeholder="Nom" <?= $adminMode ? '' : 'required' ?>
-                       id="jury_promoteur" aria-label="Promoteur·ice interne 1 — nom">
+                       id="jury_promoteur" aria-label="Promoteur·ice interne 1 — nom" autocomplete="off">
                 <button type="button" class="btn btn--sm btn--ghost admin-btn-remove"
                         onclick="removeJuryRow(this)" aria-label="Supprimer"><span aria-hidden="true">✕</span></button>
             </div>
@@ -83,7 +83,7 @@ if ($addMode) {
                     <input type="text" name="jury_promoteur[]"
                            value="<?= htmlspecialchars($pm['name']) ?>" placeholder="Nom"
                            <?= (!$adminMode && $pi === 0) ? 'required' : '' ?>
-                           aria-label="Promoteur·ice interne <?= $pi + 1 ?> — nom">
+                           aria-label="Promoteur·ice interne <?= $pi + 1 ?> — nom" autocomplete="off">
                     <button type="button" class="btn btn--sm btn--ghost admin-btn-remove"
                             onclick="removeJuryRow(this)" aria-label="Supprimer"><span aria-hidden="true">✕</span></button>
                 </div>
@@ -92,7 +92,7 @@ if ($addMode) {
             <div class="admin-jury-entry">
                 <input type="text" name="jury_promoteur[]"
                        value="<?= htmlspecialchars($juryPromoteur ?? '') ?>" placeholder="Nom" <?= $adminMode ? '' : 'required' ?>
-                       aria-label="Promoteur·ice interne 1 — nom">
+                       aria-label="Promoteur·ice interne 1 — nom" autocomplete="off">
                 <button type="button" class="btn btn--sm btn--ghost admin-btn-remove"
                         onclick="removeJuryRow(this)" aria-label="Supprimer"><span aria-hidden="true">✕</span></button>
             </div>
@@ -106,13 +106,13 @@ if ($addMode) {
 
     <?php if ($showPromoteurUlb): ?>
     <!-- Promoteur·ice(s) ULB -->
-    <fieldset class="admin-jury-lecteurs" id="jury-promoteur-ulb-row"<?= $promoteurUlbConditional ? ' style="display:none"' : '' ?>>
+    <fieldset class="admin-jury-lecteurs" id="jury-promoteur-ulb-row"<?= $promoteurUlbConditional ? ' style="display:none"' : '' ?> data-jury-autocomplete data-jury-hx-post="<?= $adminMode ? '/admin/fragments/pill-search.php' : '/partage/fragments/pill-search.php' ?>" data-jury-role="promoteur_externe">
         <legend>Promoteur·ice(s) ULB<span id="jury-ulb-asterisk" style="display:none"> <span class="asterisk">*</span></span></legend>
         <div id="jury-promoteur-ulb-list" class="admin-jury-list">
             <?php if (empty($juryPromoteursUlb) && $juryPromoteurUlb === null): ?>
             <div class="admin-jury-entry">
                 <input type="text" name="jury_promoteur_ulb_name[]" placeholder="Nom"
-                       aria-label="Promoteur·ice ULB 1 — nom">
+                       aria-label="Promoteur·ice ULB 1 — nom" autocomplete="off">
                 <button type="button" class="btn btn--sm btn--ghost admin-btn-remove"
                         onclick="removeJuryRow(this)" aria-label="Supprimer"><span aria-hidden="true">✕</span></button>
             </div>
@@ -121,7 +121,7 @@ if ($addMode) {
                 <div class="admin-jury-entry">
                     <input type="text" name="jury_promoteur_ulb_name[]"
                            value="<?= htmlspecialchars($pm['name']) ?>" placeholder="Nom"
-                           aria-label="Promoteur·ice ULB <?= $pi + 1 ?> — nom">
+                           aria-label="Promoteur·ice ULB <?= $pi + 1 ?> — nom" autocomplete="off">
                     <button type="button" class="btn btn--sm btn--ghost admin-btn-remove"
                             onclick="removeJuryRow(this)" aria-label="Supprimer"><span aria-hidden="true">✕</span></button>
                 </div>
@@ -130,7 +130,7 @@ if ($addMode) {
             <div class="admin-jury-entry">
                 <input type="text" name="jury_promoteur_ulb_name[]"
                        value="<?= htmlspecialchars($juryPromoteurUlb ?? '') ?>" placeholder="Nom"
-                       aria-label="Promoteur·ice ULB 1 — nom">
+                       aria-label="Promoteur·ice ULB 1 — nom" autocomplete="off">
                 <button type="button" class="btn btn--sm btn--ghost admin-btn-remove"
                         onclick="removeJuryRow(this)" aria-label="Supprimer"><span aria-hidden="true">✕</span></button>
             </div>
@@ -144,23 +144,20 @@ if ($addMode) {
     <?php if ($promoteurUlbConditional): ?>
     <script>
     (function() {
-        var finalitySelect = document.querySelector('select[name="finality"]');
-        var ulbRow = document.getElementById('jury-promoteur-ulb-row');
-        var ulbInput = ulbRow ? ulbRow.querySelector('input') : null;
-        var ulbAsterisk = document.getElementById('jury-ulb-asterisk');
-        function isApprofondiSelected() {
-            if (!finalitySelect) return false;
-            var selected = finalitySelect.options[finalitySelect.selectedIndex];
-            var text = (selected && selected.text) ? selected.text.toLowerCase() : '';
-            return text.includes('approfondi');
-        }
-        function toggleUlb() {
-            if (!ulbRow) return;
-            var show = isApprofondiSelected();
-            ulbRow.style.display = show ? '' : 'none';
-            if (ulbAsterisk) ulbAsterisk.style.display = show ? '' : 'none';
-            // Mark first ULB input required when finality is Approfondi
-            if (ulbRow) {
+        try {
+            var finalitySelect = document.querySelector('select[name="finality"]');
+            var ulbRow = document.getElementById('jury-promoteur-ulb-row');
+            if (!finalitySelect || !ulbRow) return;
+            var ulbAsterisk = document.getElementById('jury-ulb-asterisk');
+            function isApprofondiSelected() {
+                var opt = finalitySelect.options[finalitySelect.selectedIndex];
+                if (!opt) return false;
+                return (opt.textContent || opt.text || '').toLowerCase().includes('approfondi');
+            }
+            function toggleUlb() {
+                var show = isApprofondiSelected();
+                ulbRow.style.display = show ? '' : 'none';
+                if (ulbAsterisk) ulbAsterisk.style.display = show ? '' : 'none';
                 var inputs = ulbRow.querySelectorAll('input[name="jury_promoteur_ulb_name[]"]');
                 inputs.forEach(function(inp, idx) {
                     inp.required = <?= $adminMode ? 'false' : 'show && idx === 0' ?>;
@@ -168,24 +165,22 @@ if ($addMode) {
                     if (!show) inp.value = '';
                 });
             }
-        }
-        if (finalitySelect) {
             finalitySelect.addEventListener('change', toggleUlb);
             toggleUlb();
-        }
+        } catch(e) { console.error('jury ULB toggle:', e); }
     })();
     </script>
     <?php endif; ?>
     <?php endif; ?>
 
     <!-- Lecteur·ice(s) interne -->
-    <fieldset class="admin-jury-lecteurs">
+    <fieldset class="admin-jury-lecteurs" data-jury-autocomplete data-jury-hx-post="<?= $adminMode ? '/admin/fragments/pill-search.php' : '/partage/fragments/pill-search.php' ?>" data-jury-role="lecteur_interne">
         <legend>Lecteur·ice(s) interne<?= $adminMode ? '' : ' <span class="asterisk">*</span>' ?></legend>
         <div id="jury-lecteurs-internes-list" class="admin-jury-list">
             <?php if (empty($lecteursInternes)): ?>
             <div class="admin-jury-entry">
                 <input type="text" name="jury_lecteur_interne[]" placeholder="Nom" <?= $adminMode ? '' : 'required' ?>
-                       aria-label="Lecteur·ice interne 1 — nom">
+                       aria-label="Lecteur·ice interne 1 — nom" autocomplete="off">
                 <button type="button" class="btn btn--sm btn--ghost admin-btn-remove"
                         onclick="removeJuryRow(this)" aria-label="Supprimer"><span aria-hidden="true">✕</span></button>
             </div>
@@ -195,7 +190,7 @@ if ($addMode) {
                     <input type="text" name="jury_lecteur_interne[]"
                            value="<?= htmlspecialchars($lm['name']) ?>" placeholder="Nom"
                            <?= (!$adminMode && $li === 0) ? 'required' : '' ?>
-                           aria-label="Lecteur·ice interne <?= $li + 1 ?> — nom">
+                           aria-label="Lecteur·ice interne <?= $li + 1 ?> — nom" autocomplete="off">
                     <button type="button" class="btn btn--sm btn--ghost admin-btn-remove"
                             onclick="removeJuryRow(this)" aria-label="Supprimer"><span aria-hidden="true">✕</span></button>
                 </div>
@@ -209,13 +204,13 @@ if ($addMode) {
     </fieldset>
 
     <!-- Lecteur·ice(s) externe -->
-    <fieldset class="admin-jury-lecteurs">
+    <fieldset class="admin-jury-lecteurs" data-jury-autocomplete data-jury-hx-post="<?= $adminMode ? '/admin/fragments/pill-search.php' : '/partage/fragments/pill-search.php' ?>" data-jury-role="lecteur_externe">
         <legend>Lecteur·ice(s) externe<?= $adminMode ? '' : ' <span class="asterisk">*</span>' ?></legend>
         <div id="jury-lecteurs-externes-list" class="admin-jury-list">
             <?php if (empty($lecteursExternes)): ?>
             <div class="admin-jury-entry">
                 <input type="text" name="jury_lecteur_externe[]" placeholder="Nom" <?= $adminMode ? '' : 'required' ?>
-                       aria-label="Lecteur·ice externe 1 — nom">
+                       aria-label="Lecteur·ice externe 1 — nom" autocomplete="off">
                 <button type="button" class="btn btn--sm btn--ghost admin-btn-remove"
                         onclick="removeJuryRow(this)" aria-label="Supprimer"><span aria-hidden="true">✕</span></button>
             </div>
@@ -225,7 +220,7 @@ if ($addMode) {
                     <input type="text" name="jury_lecteur_externe[]"
                            value="<?= htmlspecialchars($lm['name']) ?>" placeholder="Nom"
                            <?= (!$adminMode && $li === 0) ? 'required' : '' ?>
-                           aria-label="Lecteur·ice externe <?= $li + 1 ?> — nom">
+                           aria-label="Lecteur·ice externe <?= $li + 1 ?> — nom" autocomplete="off">
                     <button type="button" class="btn btn--sm btn--ghost admin-btn-remove"
                             onclick="removeJuryRow(this)" aria-label="Supprimer"><span aria-hidden="true">✕</span></button>
                 </div>
@@ -247,7 +242,7 @@ function addJuryRow(listId, inputName, roleLabel) {
     var n = list.querySelectorAll('.admin-jury-entry').length + 1;
     var div = document.createElement('div');
     div.className = 'admin-jury-entry';
-    div.innerHTML = '<input type="text" name="' + inputName + '" placeholder="Nom"'
+    div.innerHTML = '<input type="text" name="' + inputName + '" placeholder="Nom" autocomplete="off"'
                   + ' aria-label="' + roleLabel + ' ' + n + ' \u2014 nom">'
                   + '<button type="button" class="btn btn--sm btn--ghost admin-btn-remove"'
                   + ' onclick="removeJuryRow(this)" aria-label="Supprimer">'