fix(FN-2159): hide manual PR controls for auto-merge tasks

- Add an autoMerge prop to PrSection and show an auto-merge hint instead of manual PR actions
- Pass project autoMerge settings from TaskDetailModal into PrSection
- Preserve active automation messaging when PR creation is already in progress
- Expand PrSection tests to cover auto-merge enabled and disabled behavior
- Increase core RunMutationContext log entry bounds test timeout to reduce flakiness

packages/core/src/store.test.ts

@@ -8598,7 +8598,7 @@ describe("RunMutationContext", () => {
       await rm(localRoot, { recursive: true, force: true });
       await rm(localGlobal, { recursive: true, force: true });
     }
-  });
+  }, 20_000);
 
   it("addComment() with runContext includes runContext in log entry", async () => {
     const localRoot = makeTmpDir();