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/srv/assets/f1.svg

@@ -0,0 +1,19 @@
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+<rect width="1000" height="800" fill="#f4f1ea"/>
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+<text x="295" y="270" font-family="Arial" font-size="30" letter-spacing="4" fill="#8b95a1" text-anchor="middle" opacity="0.55">LIVING ROOM</text>
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+<text x="775" y="560" font-family="Arial" font-size="30" letter-spacing="4" fill="#8b95a1" text-anchor="middle" opacity="0.55">BEDROOM</text>
+<text x="295" y="640" font-family="Arial" font-size="30" letter-spacing="4" fill="#8b95a1" text-anchor="middle" opacity="0.55">HALLWAY</text>
+</svg>

demo/srv/assets/garden.svg

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+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1000 700">
+<rect width="1000" height="700" fill="#eef3e6"/>
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+<text x="700" y="458" font-family="Arial" font-size="22" letter-spacing="3" fill="#6f93ad" text-anchor="middle" opacity="0.7">POOL</text>
+</svg>