Add text sensor support to CYD config generator and YAML output

[Copilot]

This change adds first-class support for Home Assistant text-based sensors in the CYD dashboard flow. Users can now configure a slot as a text sensor in the generator and get valid ESPHome YAML that updates the displayed text value.

• Config model + sensor type support

  • Added text to the SensorConfig union via TextSensorConfig (type, icon, iconColor).
  • Extended shared sensor key typing so text sensor fields are editable through existing update paths.

• Generator UI updates

  • Added Text Sensor to the sensor type selector in SensorConfigPanel.
  • Added text-sensor-specific controls (icon picker + icon color).
  • Added text sensor type label entries across locale files.

• Preview behavior

  • Updated CydScreenGrid to render text sensor icon/icon color and show a sample text value, matching the new type semantics.

• YAML generation

  • substitutions now emits text sensor icon fields:
    • ${id}_type: "text"
    • ${id}_icon
    • ${id}_icon_color
  • Added text_sensor: Home Assistant block generation that updates tile value labels on on_value.
  • Wired text_sensor generation into the main generateYaml(...) composition flow.
  • Included text sensor icons in glyph de-duplication logic.

• Focused coverage

  • Added textSensor.test.ts to verify:
    • substitutions for text sensors
    • glyph collection behavior
    • generated text_sensor YAML section and update lambda

# Generated for text sensor slots
text_sensor:
  - platform: homeassistant
    id: ha_r1c1
    entity_id: ${r1c1_entity}
    on_value:
      then:
        - lvgl.label.update:
            id: val_r1c1
            text: !lambda |-
              return x.c_str();