Improve anikoto backup search fallback

- prefer the canonical queued title for anikoto-cli backup searches instead of relying only on the ani-cli source query
- retry backup searches with alternate title variants when AniList misses the first lookup
- bump the project version to 0.46.4 and document the fix in the changelog and README

test_app.py

@@ -679,7 +679,7 @@ class DownloadQueueWorkerFailureTests(unittest.TestCase):
             },
             start_worker=False,
         )
-        job = queue.add({"query": "Queue Show", "title": "Queue Show", "season": "1", "episodes": "1"})
+        job = queue.add({"query": "Queue Source", "title": "Queue Show", "season": "1", "episodes": "1"})
 
         class FailedProc:
             pid = 1111
@@ -721,6 +721,7 @@ class DownloadQueueWorkerFailureTests(unittest.TestCase):
         self.assertIn("--exact", popen_calls[1]["env"]["FZF_DEFAULT_OPTS"])
         self.assertIn("--select-1", popen_calls[1]["env"]["FZF_DEFAULT_OPTS"])
         self.assertIn("Queue Show", popen_calls[1]["env"]["FZF_DEFAULT_OPTS"])
+        self.assertEqual(popen_calls[1]["command"][-1], "Queue Show")
 
     def test_run_job_marks_post_start_exception_failed_without_killing_worker_state(self):
         queue = APP.DownloadQueue(lambda: {"mode": "sub", "quality": "best", "download_dir": "/tmp/example"}, start_worker=False)