Never undo settings applied on the page: sync from NA Ingest, rebase stale drafts, guard the installer

- config.json is NA Ingest's live settings: the READY hours (Tue 14-22, Wed 9-19, Sun 5-14) and the
  auto-fix hours (Tue 14-22, Wed 9-21, Sun 6:30-14) set on the settings page.
- Settings page: a draft carries what its page started from. A tab that loaded the settings before
  they changed (an Apply elsewhere, a program update) now has only its own edits put on top of the
  live settings; before, it saved its whole older copy and Apply quietly undid the newer values
  (it took ready.prop_host out twice today).
- install.sh refuses (exit 4) to replace live settings that came from an Apply (their fingerprint is
  a history entry's sha_after) unless --replace-config; --keep-config still updates code only.
- Tests pin their own auto-fix and READY hours, so the campus can change its own; the exit-timeout
  test expects 310 s (the Tascam outlet power-cycle).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/test_status_panel.py

@@ -30,6 +30,8 @@ CONFIG["tiles"] = [dict(t, label="SERVICE") if t["id"] == "service" else t for t
 # A Sunday 08:00 (inside the service window) and a Wednesday 15:00 (outside it).
 SUNDAY = datetime(2026, 10, 11, 8, 0).timestamp()
 CONFIG["auto_fix"]["log_dir"] = tempfile.mkdtemp(prefix="sp-autolog-")   # never the real Desktop
+# ...and their own auto-fix hours, so the campus can change its own on the settings page.
+CONFIG["auto_fix"]["windows"] = [{"days": ["wed"], "start": "16:00", "end": "21:00"}, {"days": ["sun"], "start": "06:30", "end": "13:30"}]
 WEDNESDAY = datetime(2026, 10, 7, 15, 0).timestamp()
 
 
@@ -1447,7 +1449,8 @@ class TestFixes(unittest.TestCase):
         for t in self.engine.fix_threads:
             t.join(2)
         self.assertEqual(self.engine.running, {})
-        self.assertEqual(sp.exit_timeout(CONFIG), 90)                        # the longest fix + its verify + 10
+        # the longest fix + its verify + 10: the Tascam outlet power-cycle (timeout 300)
+        self.assertEqual(sp.exit_timeout(CONFIG), 310)
 
     def test_a_hyperdeck_switched_off_is_always_switched_back_on(self):
         calls = []