fix: full-width content area + auto-create MediaAssets on render complete

- Remove max-w-* constraints from all data/table pages so content fills available width after sidebar (Billing, MediaBrowser, OrderDetail, WorkerManagement, WorkerActivity, Materials, Tenants, AssetLibrary, NewProductOrder, ProductDetail)
- Narrow form/settings pages keep their max-width (NotificationSettings, Preferences, NewOrder, Notifications)
- render_order_line_task: create MediaAsset record on render success so results immediately appear in Media Browser without requiring the retroactive import button

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/app/tasks/step_tasks.py

@@ -644,6 +644,32 @@ def render_order_line_task(self, order_line_id: str):
             )
             session.commit()
 
+            if success:
+                # Create MediaAsset so the render appears in the Media Browser
+                try:
+                    from app.domains.media.models import MediaAsset, MediaAssetType as MAT
+                    _ext = str(output_path).rsplit(".", 1)[-1].lower() if "." in str(output_path) else "bin"
+                    _mime = "video/mp4" if _ext in ("mp4", "webm") else ("image/jpeg" if _ext in ("jpg", "jpeg") else "image/png")
+                    _is_anim = bool(line.output_type and line.output_type.is_animation)
+                    _at = MAT.turntable if _is_anim else MAT.still
+                    _tenant_id = line.product.cad_file.tenant_id if (line.product and line.product.cad_file) else None
+                    _existing = session.execute(
+                        select(MediaAsset.id).where(MediaAsset.storage_key == output_path).limit(1)
+                    ).scalar_one_or_none()
+                    if not _existing:
+                        _asset = MediaAsset(
+                            tenant_id=_tenant_id,
+                            order_line_id=line.id,
+                            product_id=line.product_id,
+                            asset_type=_at,
+                            storage_key=output_path,
+                            mime_type=_mime,
+                        )
+                        session.add(_asset)
+                        session.commit()
+                except Exception:
+                    logger.exception("Failed to create MediaAsset for order_line %s", order_line_id)
+
             if success:
                 emit(order_line_id, f"Render completed in {elapsed:.1f}s", "success")
             else: