feat(wds): add manual sync trigger button with force-run mode

- triggerForceSync() resets error steps, clears lastSessionDate, starts sync immediately
- Force mode uses extended night window (22:00-05:00) instead of weekend-only
- API action 'trigger' starts sync in background, returns immediately
- 'Porneste sync' button in header (hidden when already running)
- Respects __parcelSyncRunning guard to prevent concurrent runs

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/app/api/eterra/weekend-sync/route.ts

@@ -3,6 +3,7 @@ import { PrismaClient, Prisma } from "@prisma/client";
 import {
   isWeekendWindow,
   getWeekendSyncActivity,
+  triggerForceSync,
 } from "@/modules/parcel-sync/services/weekend-deep-sync";
 
 const prisma = new PrismaClient();
@@ -151,13 +152,25 @@ export async function GET() {
 export async function POST(request: Request) {
   // Auth handled by middleware (route is not excluded)
   const body = (await request.json()) as {
-    action: "add" | "remove" | "reset" | "reset_all" | "set_priority";
+    action: "add" | "remove" | "reset" | "reset_all" | "set_priority" | "trigger";
     siruta?: string;
     name?: string;
     county?: string;
     priority?: number;
   };
 
+  // Trigger is handled separately — starts sync immediately
+  if (body.action === "trigger") {
+    const result = await triggerForceSync();
+    if (!result.started) {
+      return NextResponse.json(
+        { error: result.reason },
+        { status: 409 },
+      );
+    }
+    return NextResponse.json({ ok: true, message: "Sincronizare pornita" });
+  }
+
   const state = await getOrCreateState();
 
   switch (body.action) {