feat: feedback visuel immédiat après drag-and-drop + correction résolution IDs labels

- /api/move retourne maintenant les labels mis à jour
- Le frontend met à jour les labels de la carte sans recharger la page
- Flash vert sur la carte pour confirmer le succès du déplacement
- Correction: résolution noms→IDs des labels via l'API Gitea (update_issue_labels attend des ints)
- Mise à jour de data-column sur la carte déplacée

app/routers/api.py

@@ -139,6 +139,7 @@ async def move_card(
 
         conn.commit()
 
+    labels = []
     if mapping:
         try:
             if mapping["close_issue"]:
@@ -147,13 +148,20 @@ async def move_card(
                 issue = await gitea.get_issue(owner, repo, issue_id)
                 current_labels = [lbl["name"] for lbl in issue.get("labels", [])]
                 status_labels = await _get_status_labels(owner, repo, board_id)
-                filtered = [l for l in current_labels if l not in status_labels]
-                filtered.append(mapping["gitea_label"])
-                await gitea.update_issue_labels(owner, repo, issue_id, filtered)
+                filtered_names = [l for l in current_labels if l not in status_labels]
+                filtered_names.append(mapping["gitea_label"])
+
+                # Resolve label names to IDs
+                all_labels = await gitea.get_labels(owner, repo)
+                name_to_id = {lbl["name"]: lbl["id"] for lbl in all_labels}
+                label_ids = [name_to_id[n] for n in filtered_names if n in name_to_id]
+
+                result = await gitea.update_issue_labels(owner, repo, issue_id, label_ids)
+                labels = [{"name": lbl["name"], "color": lbl.get("color", "666")} for lbl in result]
         except Exception as e:
             logger.warning("Gitea sync failed: %s", e)
 
-    return {"status": "ok", "issue_id": issue_id, "column": column}
+    return {"status": "ok", "issue_id": issue_id, "column": column, "labels": labels}
 
 
 async def _get_status_labels(owner: str, repo: str, board_id: int) -> list[str]: