[lvgl] Document rounded property for meter arcs

[clydebarrow]

Description

Related issue (if applicable): fixes

Pull request in esphome with YAML changes (if applicable):

• [lvgl] Support rounded property for meter arcs esphome#16669

Checklist

• I am merging into next because this is new documentation that has a matching pull-request in esphome as linked above.
  or

• I am merging into current because this is a fix, change and/or adjustment in the current documentation and is not for a new component or feature.

• Link added in /src/content/docs/components/index.mdx when creating new documents for new components or cookbook.

New Component Images

If you are adding a new component to ESPHome, you can automatically generate a standardized black and white component name image for the documentation.

To generate a component image:

1. Comment on this pull request with the following command, replacing component_name with your component name in lower_case format with underscores (e.g., bme280, sht3x, dallas_temp):

   @esphomebot generate image component_name
   

2. The ESPHome bot will respond with a downloadable ZIP file containing the SVG image.

3. Extract the SVG file and place it in the /public/images/ folder of this repository.

4. Use the image in your component's index table entry in /src/content/docs/components/index.mdx.

Example: For a component called "DHT22 Temperature Sensor", use:

@esphomebot generate image dht22

Note: All images used in ImgTable components must be placed in /public/images/ as the component resolves them to absolute paths.

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[Copilot]

Pull request overview

Documents the LVGL meter arc rounded configuration option in the ESPHome docs, extending the existing meter widget configuration reference.

Changes:

• Adds documentation for the rounded boolean under meter -> scales -> indicators -> arc.

[wise-fern]

There is the Items entry in the documentation that claims it should hold style properties for the arcs. This should probably be updated to be more clear about what can be put there.
https://github.com/esphome/esphome-docs/blob/5a457a89d714daf386d316085a9fe0e9e07fcc74/src/content/docs/components/lvgl/widgets.mdx?plain=1#L1333

(I originated the issue on Discord if that matters)

[clydebarrow]

There is the Items entry in the documentation that claims it should hold style properties for the arcs. This should probably be updated to be more clear about what can be put there.

Thanks - will check if that still works and update accordingly.