fix(schema-viewer): drop empty schema panel for image-less BOM overviews

PL24's bomOverviewlist widget (PR-code-filtered overview tables like
"Alternatöre genel bakış · Start-Stop modu bulunan araçlar için
[PR:7L6,7L8]") returns parts but no illustration — upstream genuinely
has no schema for these. Previously the 60% left panel rendered the
text "Sema goruntusu bulunamadi", which reads like a failure and
wastes most of the layout for what is actually a complete result.

When schemaPic is null, skip the schema panel entirely and let the
parts list take the full container width. The parts panel already
handles its own header/empty state, so no other adjustment needed.

apps/web/src/components/schema/schema-viewer.tsx

@@ -85,6 +85,28 @@ export function SchemaViewer({
     );
   }
 
+  // PL24 "bomOverviewlist" widget pages (PR-code-filtered overviews) return
+  // parts but no illustration. Drop the schema panel entirely in that case
+  // so the parts list takes full width instead of staring at a sad fallback.
+  if (!schemaPic) {
+    return (
+      <div
+        ref={containerRef}
+        className={cn(
+          "rounded-lg border border-border bg-background",
+          isFullscreen ? "fixed inset-0 z-50 rounded-none" : "md:h-[700px]",
+        )}
+      >
+        <PartsPanel
+          parts={parts}
+          vehicleId={vehicleId}
+          categoryId={categoryId}
+          isLoading={isLoading}
+        />
+      </div>
+    );
+  }
+
   return (
     <div
       ref={containerRef}
@@ -112,38 +134,32 @@ export function SchemaViewer({
           onTouchMove={interaction.onTouchMove}
           onTouchEnd={interaction.onTouchEnd}
         >
-          {schemaPic ? (
-            <div
-              className="absolute inset-0 flex items-center justify-center"
-              style={{
-                transform: `scale(${zoom}) translate(${panX / zoom}px, ${panY / zoom}px)`,
-                transformOrigin: "center center",
-                willChange: "transform",
-              }}
-            >
-              <div className="relative">
-                <img
-                  src={schemaPic.url}
-                  alt={schemaPic.label || "Şema görüntüsü"}
-                  width={schemaPic.width > 0 ? schemaPic.width : undefined}
-                  height={schemaPic.height > 0 ? schemaPic.height : undefined}
-                  className="max-h-full max-w-full select-none object-contain"
-                  draggable={false}
+          <div
+            className="absolute inset-0 flex items-center justify-center"
+            style={{
+              transform: `scale(${zoom}) translate(${panX / zoom}px, ${panY / zoom}px)`,
+              transformOrigin: "center center",
+              willChange: "transform",
+            }}
+          >
+            <div className="relative">
+              <img
+                src={schemaPic.url}
+                alt={schemaPic.label || "Şema görüntüsü"}
+                width={schemaPic.width > 0 ? schemaPic.width : undefined}
+                height={schemaPic.height > 0 ? schemaPic.height : undefined}
+                className="max-h-full max-w-full select-none object-contain"
+                draggable={false}
+              />
+              {schemaPic.width > 0 && schemaPic.height > 0 && (
+                <HotspotOverlay
+                  hotspots={hotspots}
+                  imageWidth={schemaPic.width}
+                  imageHeight={schemaPic.height}
                 />
-                {schemaPic.width > 0 && schemaPic.height > 0 && (
-                  <HotspotOverlay
-                    hotspots={hotspots}
-                    imageWidth={schemaPic.width}
-                    imageHeight={schemaPic.height}
-                  />
-                )}
-              </div>
+              )}
             </div>
-          ) : (
-            <div className="flex h-full items-center justify-center text-sm text-muted-foreground">
-              Sema goruntusu bulunamadi
-            </div>
-          )}
+          </div>
         </div>
       </div>