Move capture button left of search; always visible; disabled when server-disabled

- capture-btn moved to first child of trace-topbar (before search input)
- Button always visible: shows Start/Stop/Connect-to-server as before
- When server capture is disabled: grayed-out Start Capture with
  tooltip via existing i18n key 'Capture is disabled ...'
- No more hiding button when viewing saved session or when disabled
- Bump 1.22.4, SW cache v35->v36

tests/test_pcap_import.py

@@ -224,7 +224,7 @@ class TestImportEndpoint(unittest.TestCase):
 class TestVersion(unittest.TestCase):
     def test_package_version(self):
         from simtrace2_pysniff import __version__
-        self.assertEqual(__version__, '1.22.3')
+        self.assertEqual(__version__, '1.22.4')
 
     def test_status_includes_version(self):
         import os