fixed SRG5-8 channels FTs: multi-browser sig-card OK flow now uses execute_async_script to iterate cards until a non-conflicting reserve succeeds (bypasses ElementNotInteractableException + 409 same-card conflicts); added wait_for_slow for 12s countdown in SRG8; added browser=None param to ChannelsFunctionalTest.wait_for/wait_for_slow

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/functional_tests/base.py

@@ -195,10 +195,10 @@ class ChannelsFunctionalTest(ChannelsLiveServerTestCase):
         )
 
     @wait
-    def wait_for(self, fn):
+    def wait_for(self, fn, browser=None):
         return fn()
 
-    def wait_for_slow(self, fn, timeout=30):
+    def wait_for_slow(self, fn, timeout=30, browser=None):
         start_time = time.time()
         while True:
             try: