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_schema.py

@@ -295,7 +295,9 @@ class TestSchemaMatchesCode(unittest.TestCase):
     def test_phrases(self):
         cfg = sp.load_config(os.path.join(ROOT, "config.json"))
         p = schema.phrases(cfg)
-        self.assertEqual(p["auto_fix"], "may run by itself on Sundays 06:30-13:30")
+        self.assertEqual(p["auto_fix"], "may run by itself " + sp.windows_phrase(cfg["auto_fix"]["windows"]))   # the campus's own hours
+        self.assertEqual(schema.phrases(dict(cfg, auto_fix={"windows": [{"days": ["sun"], "start": "06:30", "end": "13:30"}]}))["auto_fix"],
+                         "may run by itself on Sundays 06:30-13:30")
         self.assertEqual(p["live"], "changes wait while a HyperDeck is recording")
         self.assertEqual(p["hold"], "HOLD 2s")
         self.assertEqual(sp.windows_phrase([{"days": ["sat", "sun"], "start": "18:00", "end": "00:30"}]),