v1.50.2: the v1.50.1 review (HP-1501-01, HP-1501-02)

- HP-1501-01: v1.50.1 bounded layout positions and left room rectangles,
  polygon vertices, view_box and opening coordinates on bare _finite — the
  same absurd-magnitude failure, one schema over. _GEOM (±4) covers them all
  now, opening angles get ±360. And because a store may already hold such a
  vertex from before the door existed, contentBounds applies its canvas
  envelope to room geometry exactly as it does to device positions: the
  point renders where it is, the frame ignores it, a space of nothing but
  absurd points falls back to the whole canvas.
- HP-1501-02: a repair matching zero positions answered ok/moved:0 and
  replaced the one-deep backup with an empty one — a typo right after
  repairing the wrong space destroyed the promised way back. Empty match is
  nothing_to_repair now: no write, no revision bump, backup intact.

Old test fixtures carried view_box [0,0,100,100] from the render-unit days;
they now use the normalised box the product actually stores.

custom_components/houseplan/websocket_api.py

@@ -212,6 +212,16 @@ async def ws_geometry_repair(hass: HomeAssistant, connection, msg: dict[str, Any
             k: dict(v) for k, v in layout.items()
             if isinstance(v, dict) and str(v.get("s")) == space_id
         }
+        if not touched:
+            # A typo'd space id used to "succeed" with moved: 0 — and its
+            # empty result REPLACED the one-deep backup, destroying the very
+            # undo this endpoint promises (HP-1501-02). Nothing to move means
+            # nothing to save: no write, no revision bump, the backup stays.
+            connection.send_error(
+                msg["id"], "nothing_to_repair",
+                f"No stored positions belong to space '{space_id}'",
+            )
+            return
         preview = {k: dict(v) for k, v in touched.items()}
         migrate_layout(preview, {space_id: msg["aspect"]})
         if msg.get("dry_run"):