test(ai): expand AI flow and clipboard semantic coverage

- Cover reply-variant decision paths, scene-detector abstention, and
  the merged reply center stance catalog.
- Lock in clipboard semantic analyzer thresholds, complaint-only
  suppression, and existing-skill routing.
- Add durable session, refresh, and managed-gateway reliability tests
  for the Apple account path.
- Verify personal-style prompt derivation, low-confidence ASR
  tendencies, and Polish style learning against real corpus evidence.
- Exercise the assistant keyboard and Polish styles UI flows in
  end-to-end UI tests.

OSGKeyboardTests/FlowReliabilityTests.swift

@@ -177,12 +177,31 @@ final class FlowReliabilityTests: XCTestCase {
             }
             XCTFail("Expected timeout")
         } catch {
-            XCTAssertTrue(error is CancellationError)
+            XCTAssertEqual(error as? HardTimeoutError, .timedOut)
         }
 
         XCTAssertLessThan(Date().timeIntervalSince(started), 0.2)
     }
 
+    func testHardTimeoutPreservesCallerCancellation() async {
+        let task = Task {
+            try await HardTimeout.run(seconds: 5) {
+                try await Task.sleep(nanoseconds: 5_000_000_000)
+                return "late"
+            }
+        }
+        await Task.yield()
+        task.cancel()
+
+        do {
+            _ = try await task.value
+            XCTFail("Expected caller cancellation")
+        } catch {
+            XCTAssertTrue(error is CancellationError, "Unexpected error: \(error)")
+            XCTAssertNil(error as? HardTimeoutError)
+        }
+    }
+
     func testAudioRoutePolicyRebuildsHFPTransitions() {
         XCTAssertTrue(
             FlowAudioRouteRecoveryPolicy.shouldRebuild(