Offer Use now from the finished test's own order

The fix review found Use now could still point the wrong way: the button was
worked out from per-address ranks in the devices list while the test was still
running (a better-ranked address might yet answer), and the test's successes
changed those ranks before the list was reloaded.

The test now finishes by publishing the order a reconnect on this network would
try, worked out after it has recorded where each address works, together with
the network it ran on. The page offers Use now only once the test is done, only
for that network, and only on the first address in that order that passed. The
ranks in the devices list are gone again. docs/devices.md no longer promises
where a reconnect lands: a slow address loses to a later one.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

tests/test_link.py

@@ -304,19 +304,6 @@ class Connecting(unittest.TestCase):
         self.assertEqual(self.link.active_device()["alias"], "frame-bare")
         self.assertEqual(self.routes[-1][0], "frame-bare")
 
-    def test_devices_view_ranks_addresses_for_the_current_network(self):
-        # The page offers Use now only on the address a reconnect would pick: rank says which.
-        d = self.device("frame.tail1234.ts.net")
-        self.reg.add_address(d["id"], "192.168.1.40", kind="lan", first=True)
-        self.reg.record_success(d["id"], "frame.tail1234.ts.net", "n-home", 6.0)
-        self.link.state["network"] = {"id": "n-home", "name": "Home", "tailscale": {"up": True}}
-        view = next(x for x in fl.devices_view(self.link)["devices"] if x["id"] == d["id"])
-        self.assertEqual({a["host"]: a["rank"] for a in view["addresses"]},
-                         {"192.168.1.40": 1, "frame.tail1234.ts.net": 0})  # only Tailscale worked here so far
-        self.reg.record_success(d["id"], "192.168.1.40", "n-home", 1.0)
-        view = next(x for x in fl.devices_view(self.link)["devices"] if x["id"] == d["id"])
-        self.assertEqual([a["rank"] for a in view["addresses"]], [0, 1])  # now the user's order decides
-
     def test_removing_the_headset_frame_alias_named_doesnt_bring_it_back_bare(self):
         d = self.device("localhost")
         self.link.override = self.link.session_alias = "frame-t"
@@ -462,11 +449,19 @@ class Connecting(unittest.TestCase):
         d = self.device("::1", "127.0.0.1", "nothing.invalid")
         self.pin(d["id"])
         self.hosts({"::1": "wrong", "127.0.0.1": "ok"})
+        self.link.state["network"] = {"id": "n-home", "name": "Home", "tailscale": {"up": False}}
         self.link.test(d["id"])
         rows = {r["host"]: r for r in self.link.snapshot()["tests"][d["id"]]["rows"]}
         self.assertEqual(rows["127.0.0.1"]["ssh"], "ok")
         self.assertEqual(rows["::1"]["ssh"], "wrong")
         self.assertEqual(rows["nothing.invalid"]["state"], "unresolved")
+        done = self.link.snapshot()["tests"][d["id"]]
+        self.assertTrue(done["done"])
+        self.assertEqual(done["network"], "n-home")
+        # The address that passed has now worked on this network, so a reconnect tries it first:
+        # the page offers Use now from this order, which comes with the finished result.
+        self.assertEqual(done["order"][0], "127.0.0.1")
+        self.assertEqual(sorted(done["order"]), sorted(["::1", "127.0.0.1", "nothing.invalid"]))
         self.assertEqual(self.routes, [])
         self.assertTrue(all("ControlPath=none" in c for c in self.calls() if "-G" not in c))