feat v1.14.0: per-space display settings, hand-drawn spaces, manual-testing checklist

- space dialog 'Display' section: room borders/names toggles, color+opacity,
  fill by zigbee signal or lights (tri-state: on/off/no-lights)
- draggable room name labels persisted as layout rl_<roomId>
- 'no image, outline by hand' space source with canvas orientation; image
  optional now; switching an existing space to draw detaches its plan
- demo/ synthetic-home harness lives in the repo (serve.mjs + smokes + icons gen)
- docs/TESTING.md checklist (same-commit update policy); self-run found and
  fixed: plan_url not detached on image->draw, _stateClass crash on states
  without entity_id; perf measured (162 devices ~14ms build)
- backend: SPACE_DISPLAY_SCHEMA validation (+test)

src/i18n/en.json

@@ -151,5 +151,20 @@
   "import.manual": "Start from scratch",
   "import.progress": "Floor {i} of {n}",
   "import.done": "Spaces created. Outline the rooms: click grid dots and close the contour.",
-  "btn.skip": "Skip"
+  "btn.skip": "Skip",
+  "space.display_section": "Display",
+  "space.show_borders": "Always show room borders",
+  "space.show_names": "Show room names (drag to move)",
+  "space.room_color": "Border & name color",
+  "space.opacity": "Opacity",
+  "space.fill_label": "Room fill",
+  "fill.none": "None",
+  "fill.lqi": "Zigbee signal (red → green)",
+  "fill.light": "Lights (yellow = on, grey = off)",
+  "space.source_file": "I have a floor-plan image",
+  "space.source_draw": "No image — I'll outline rooms by hand",
+  "space.orientation": "Canvas",
+  "orient.landscape": "Landscape",
+  "orient.portrait": "Portrait",
+  "orient.square": "Square"
 }