fix: use getElementById for relink FilePond pool lookup

FilePond 4.x wraps the original input element in its own DOM structure
which can break CSS attribute selectors. querySelector with
.tfe-file-picker[data-queue-type='...'] returned null even though the
element existed and was initialized.

Switched to getElementById with a queueType→inputId map:
  cover → couverture
  note_intention → note_intention
  tfe → tfe-files-input
  annexe → annexe-files-input

getElementById is both faster and immune to FilePond's DOM wrapping.

app/public/assets/js/app/file-upload-filepond.js

@@ -892,18 +892,21 @@
 				}
 				console.log(`[relink] success | new_id=${data.id}`);
 
-				// Add the new file to the FilePond pool, then close the modal.
-				// If the DOM was replaced (e.g. live-reload), refresh the
-				// form fragment via HTMX so the server re-renders the pools
-				// with the newly-linked file included.
-				var input = document.querySelector(
-					`.tfe-file-picker[data-queue-type="${queueType}"]`,
-				);
+				// Look up the FilePond pool by the known input ID for this queue type.
+				// querySelector on data-queue-type is unreliable after FilePond
+				// wraps the original input element.
+				var inputIdMap = {
+					cover: "couverture",
+					note_intention: "note_intention",
+					tfe: "tfe-files-input",
+					annexe: "annexe-files-input",
+				};
+				var inputId = inputIdMap[queueType] || null;
+				var input = inputId ? document.getElementById(inputId) : null;
 				console.log(
-					"[relink] looking for input | selector=" +
-						`.tfe-file-picker[data-queue-type="${queueType}"]` +
-						" | found=" +
-						!!input,
+					"[relink] looking for input | queueType=" + queueType +
+						" | inputId=" + inputId +
+						" | found=" + !!input,
 				);
 				var closeModal = () => {
 					var modal = document.getElementById("relink-modal");
@@ -1013,8 +1016,9 @@
 				}
 				console.log(`[pt-relink] success | new_id=${data.id}`);
 
-				var input = document.querySelector(
-					'.tfe-file-picker[data-queue-type="tfe"]',
+				var input = document.getElementById("tfe-files-input");
+				console.log(
+					"[pt-relink] looking for input | inputId=tfe-files-input | found=" + !!input,
 				);
 				var closeModal = () => {
 					var modal = document.getElementById("peertube-relink-modal");