Step 2: the settings page can change things - shared draft, Review & Apply, rollback, history, undo

- settings/apply.py: the Apply pipeline (check, keep history, write, restart the watchdog, re-import
  pages by the marker-only rule, recolour page keys), rollback when the watchdog does not come back,
  the recording guard with the Emergency (LIVE) override, history entries and Go back / Undo.
- settings/server.py: the write routes behind the editing code (draft PUT/DELETE with 409 on a
  conflict, validate, apply, restore, undo, watchdog restart/stop/start, commands to the watchdog,
  the switcher file upload / pick newest / discard, gear notes).
- settings/ui/app.js: every screen grows inputs with Editing on; keys (checks, fixes, hold-always,
  members), computers, fixes, site setup (schedules, Dante devices, Spotify, ATEM), Review & Apply
  with live progress, History with Go back and Undo, Run this fix now.
- schema.unmask, push_page.push, nav_keys.colour; tests for all of it (163 pass).
- Verified live on NA Ingest: a page-only Apply, a restart Apply, Undo, history.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

nav_keys.py

@@ -75,6 +75,37 @@ def find_nav_keys(host, port, status_page):
     return found
 
 
+def colour(host, port, status_page, coloured, record_path, revert=False):
+    """Colour (or restore) the nav keys on every page; returns how many keys changed."""
+    record = json.load(open(record_path)) if os.path.exists(record_path) else {}
+    found = find_nav_keys(host, port, status_page)
+    if revert:
+        work = [(p, r, c, k, "restore") for p, r, c, k, ours in found if ours]
+    else:
+        work = [(p, r, c, k, "colour") for p, r, c, k, ours in found if k in coloured]
+        work += [(p, r, c, k, "restore") for p, r, c, k, ours in found if ours and k not in coloured]
+    ws = WebSocket(host, port, "/trpc")
+    done = 0
+    try:
+        api = Trpc(ws)
+        for page, row, col, kind, what in work:
+            location = {"pageNumber": page, "row": row, "column": col}
+            if what == "restore":
+                api.mutation("controls.resetControl", {"location": location, "newType": kind})
+                record.pop("%d/%d/%d" % (page, row, col), None)
+            else:
+                r, c = NAV_LOCATIONS[kind]
+                source = {"pageNumber": status_page, "row": int(r), "column": int(c)}
+                if not api.mutation("controls.copyControl", {"fromLocation": source, "toLocation": location}):
+                    raise RuntimeError("copy to page %d row %d col %d failed" % (page, row, col))
+                record["%d/%d/%d" % (page, row, col)] = kind
+            done += 1
+    finally:
+        ws.close()
+        json.dump(record, open(record_path, "w"), indent=1, sort_keys=True)
+    return done
+
+
 def main():
     cfg = json.load(open(os.path.join(HERE, "config.json")))
     ap = argparse.ArgumentParser(description=__doc__.splitlines()[0])