fix(parcel-sync): sync progress visible during GPKG/bundle export

3 bugs fixed:
- syncLayer was called without jobId -> user saw no progress duringSync
- syncLayer set status:'done' prematurely -> client stopped polling before GPKG phase
- syncLayer errors were silently ignored -> confusing 'no features in DB' error

Added isSubStep option to syncLayer: when true, keeps status as 'running'
and doesn't schedule clearProgress. Export routes now pass jobId + isSubStep
so the real sync progress (Descărcare features 50/200) is visible in the UI.

src/app/api/eterra/export-bundle/route.ts

@@ -196,13 +196,16 @@ export async function POST(req: Request) {
             : "Sync inițial";
         pushProgress();
 
-        await syncLayer(
+        const syncResult = await syncLayer(
           validated.username,
           validated.password,
           validated.siruta,
           terenuriLayerId,
-          { forceFullSync: validated.forceSync },
+          { forceFullSync: validated.forceSync, jobId, isSubStep: true },
         );
+        if (syncResult.status === "error") {
+          throw new Error(syncResult.error ?? "Sync terenuri failed");
+        }
       }
       updatePhaseProgress(1, 2);
 
@@ -214,13 +217,16 @@ export async function POST(req: Request) {
             : "Sync inițial";
         pushProgress();
 
-        await syncLayer(
+        const syncResult = await syncLayer(
           validated.username,
           validated.password,
           validated.siruta,
           cladiriLayerId,
-          { forceFullSync: validated.forceSync },
+          { forceFullSync: validated.forceSync, jobId, isSubStep: true },
         );
+        if (syncResult.status === "error") {
+          throw new Error(syncResult.error ?? "Sync clădiri failed");
+        }
       }
       updatePhaseProgress(2, 2);
     } else {
@@ -233,6 +239,7 @@ export async function POST(req: Request) {
     /* ══════════════════════════════════════════════════════════ */
     /*  Phase 2: Enrich (magic mode only)                        */
     /* ══════════════════════════════════════════════════════════ */
+    // Take back progress control after syncLayer
     if (validated.mode === "magic") {
       setPhaseState("Verificare îmbogățire", weights.enrich, 1);