v1.52.0: one look for light sources, whatever flipped them

Owner's rule, agreed 2026-07-29 after a field report (a lamp turned off by
tap looked different from one turned off by the wall switch):

- a lamp's colour lives ONLY in its glow. The v1.27 RGB tint of the icon,
  border and shadow is deleted — that tint was the fork: with colour data
  the lamp rendered dark-with-coloured-icon, without it plain yellow, and
  the same lamp crossed the fork depending on how it was switched.
- in glow fill the indicator IS the spot: a source's badge stays standard,
  lit or not (litLightEntity — the exact condition that casts the spot —
  gates the suppression, so a lit socket keeps its yellow even in glow).
- in every other fill a lit source is plain yellow, like a heating TRV.
- icon morphing stays everywhere; the ripple colour still falls back to the
  light colour (both explicitly confirmed by the owner).

smoke_light_badges covers the whole table (8 assertions); smoke_rgb_alarm
re-asserted: no rgb class, lit lamp yellow, ripple fallback keeps the
colour. README colour language updated. Inventory: 147 / 51 / 43 / 70.

docs/TESTING.md

@@ -244,6 +244,11 @@ Run the *core flows* (marked ★ below) in each environment at least once per mi
       at 70% of a device icon and zooming WITH the plan; the small metric rows
       under the room name now show in the plan editor too
       [auto: smoke_room_cards gearDetached/plainInPlan]
+- [ ] Light-source badges (v1.52.0): in glow fill a lit lamp's badge stays
+      standard (the spot is the indicator) and a lit socket stays yellow; in
+      other fills a lit lamp is plain yellow with no RGB tint; morphing and
+      the ripple colour fallback survive [auto: smoke_light_badges +
+      smoke_rgb_alarm]
 - [ ] Icon size multiplier scales the glyph (dev): set a marker's size to 3 —
       the icon inside grows with the badge instead of staying default
       [auto: smoke_icon_scale]