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)

demo/README.md

@@ -0,0 +1,17 @@
+# Synthetic demo home
+
+A fully fictional house (plans, devices, states) used for README screenshots,
+the demo GIF and headless smoke tests — so no real home data ever appears in
+public materials.
+
+- `srv/demo.html` — self-contained host page: `<ha-icon>`/`<ha-card>` stubs and a
+  fake `hass` (registries, states, `callWS`, `callService`, floors).
+- `srv/assets/` — generated plan SVGs and `icons.js` (`node demo/gen_icons.mjs`,
+  needs the repo's devDependencies). The card bundle is copied from `dist/`:
+  `cp dist/houseplan-card.js demo/srv/assets/`.
+- `serve.mjs` — playwright launcher (route interception, no web server).
+- `smoke_*.mjs` — feature smoke tests; run with a Chromium installed via
+  `PLAYWRIGHT_BROWSERS_PATH=<dir> npx playwright install chromium-headless-shell`.
+
+Note for sandboxed sessions: `/tmp` does not survive; this directory is the
+persistent home of the harness (docs/DEVELOPMENT.md has the LD_LIBRARY_PATH recipe).