feat(update): add setup fallback action and bump 2.1.2

- add installer asset detection in update service

- add 'Download and install (setup)' action in update dialog

- bump app version to 2.1.2 and extend update service test

tests/test_update_service.py

@@ -33,6 +33,7 @@ class UpdateServiceTests(unittest.TestCase):
             "assets": [
                 {"name": "notes.txt", "browser_download_url": "https://example.com/notes.txt"},
                 {"name": "AnabasisManager-win64.zip", "browser_download_url": "https://example.com/app.zip"},
+                {"name": "AnabasisManager-setup-1.7.2.exe", "browser_download_url": "https://example.com/setup.exe"},
                 {"name": "AnabasisManager-win64.zip.sha256", "browser_download_url": "https://example.com/app.zip.sha256"},
             ],
         }
@@ -43,6 +44,7 @@ class UpdateServiceTests(unittest.TestCase):
         )
         self.assertEqual(payload["latest_version"], "1.7.2")
         self.assertEqual(payload["download_url"], "https://example.com/app.zip")
+        self.assertEqual(payload["installer_url"], "https://example.com/setup.exe")
         self.assertEqual(payload["checksum_url"], "https://example.com/app.zip.sha256")
         self.assertTrue(payload["has_update"])