Lighter tile model, mini-slider handle, CYD light cards, wifi without modem sleep (0.2.24)

App 0.2.24 / firmware 0.2.20.

- Forecast and hourly data live in vectors that only weather tiles fill:
  Tile 2016 -> 1216 bytes, CYD free heap 20-26 KB -> 34-37 KB in the self-test.
- The bottom mini slider shows the same white handle as the control sliders.
- CYD light/fan/cover card uses the Guition light palette (last dark-theme remnant).
- power_save_mode: none in the wizard YAML and board profiles; docs explain
  adding it to existing YAMLs. Rendering review in docs/TEST_RESULTS_0224.md.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

guition-4848s040.yaml

@@ -1,7 +1,7 @@
 # Guition ESP32-S3-4848S040 / 4-inch EU wallbox, 480x480 IPS + GT911.
 # Use guition-device.yaml; see docs/GUITION.md. CYD hardware is a separate profile.
 substitutions:
-  SCREEN_FIRMWARE_VERSION: "0.2.19"
+  SCREEN_FIRMWARE_VERSION: "0.2.20"
   DYNAMIC_TILES: "false"
   DASHBOARD_INBOX_INTERNAL: "true"
   DEVICE_NAME: "guition-wallbox"
@@ -834,6 +834,8 @@ ota:
 wifi:
   ssid: !secret wifi_ssid
   password: !secret wifi_password
+  # Mains-powered panel: no modem sleep, so HA updates and OTA arrive without beacon latency.
+  power_save_mode: none
   ap:
     ssid: "Smartdisplay Fallback Hotspot"
     password: !secret ap_password