fix: surface hidden errors and add batch rejection tests

Fix empty catch blocks in settings dialog (logo upload/delete) and
automate page (pipeline save) that silently swallowed errors. Users
now see error messages when these operations fail.

Add 5 integration tests verifying batch endpoint returns 404 for
custom-route tools (remove-background, upscale, ocr, blur-faces,
erase-object), matching the pipeline rejection tests.

apps/web/src/pages/automate-page.tsx

@@ -66,9 +66,12 @@ export function AutomatePage() {
         });
         if (res.ok) {
           await loadPipelines();
+        } else {
+          const data = await res.json().catch(() => ({}));
+          setExecutionError(data.error || "Failed to save pipeline");
         }
       } catch {
-        // Error handling could be added
+        setExecutionError("Connection error while saving pipeline.");
       } finally {
         setSaving(false);
       }