Colour the sliders of playing media players, covers and numbers (0.2.60)

Since firmware 0.2.42 a slider showed the tile's colour only while
Tile::active() held, which is never true for a playing, paused or idle
media player, a cover or a number, so their volume, position and value
sliders stayed grey like a light that is off.

Tile::slider_active() follows Home Assistant's tile sliders instead: grey
for an unavailable entity, a light or fan that is off and a media player
that is off or in standby; a closed cover keeps its colour as in HA's
cover position feature, and a number with a value is active. The sliders
of direct controls on wide tiles and the small sliders use it;
Tile::active() and its other uses are unchanged.

Checked with 282 Python and 15 C++ tests, generate_packages --check, ESP32
builds of both check profiles and host renders of both boards.
Firmware 0.2.52.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

guition-4848s040.yaml

@@ -2,7 +2,7 @@
 # Source profile for packages/guition.yaml (tools/generate_packages.py); see docs/GUITION.md.
 # A screen gets its tiles from the ESP Screen Manager add-on while it runs. The CYD is its own profile.
 substitutions:
-  SCREEN_FIRMWARE_VERSION: "0.2.51"
+  SCREEN_FIRMWARE_VERSION: "0.2.52"
   # 0: no drift limit; LVGL decides, releasing inside the tile is a tap, leaving it is not
   # (like iOS). The CYD keeps a limit because its resistive panel jumps.
   TOUCH_MOVE_LIMIT_PX: "0"