Complete LaMetric integration documentation for quality scale

[frenck]

Proposed change

Completes the LaMetric integration documentation to address all docs todo items in the integration's quality scale (quality_scale.yaml in core).

Adds or rewrites:

• Use cases: four practical examples (notifications, charts, device control, app cycling).
• Supported devices: LaMetric TIME.
• Installation parameters: configuration_basic block for Host and API key, with a note about automatic vs manual setup.
• Supported functionality: full entity breakdown for buttons, numbers, selects, sensors, switches, and the update entity, with entity categories, all verified against strings.json.
• Data updates: 30-second polling interval.
• Known limitations: local network requirement, USB brightness limit, fixed sound list.
• Examples: three automation examples (arrival notification, temperature chart, doorbell with sound).
• Troubleshooting: kept the USB brightness section and added a cannot-connect section.
• Removing the integration: standard removal include.
• Related: link to debug logs and diagnostics in frontmatter.

Cleanup:

• Fixed "performed action against an LaMetric" grammar.
• Renamed List of notification sounds to Notification sounds (sentence case).
• Sorted the sounds list.
• Tightened a few awkward sentences.

All details verified against config_flow.py, coordinator.py, const.py, strings.json, services.yaml, and quality_scale.yaml in core.

Type of change

• Spelling, grammar or other readability improvements
• Adjusted missing or incorrect information in the current documentation
• Added documentation for a new integration I'm adding to Home Assistant
• Added documentation for a new feature I'm adding to Home Assistant
• Removed stale or deprecated documentation

Additional information

Checklist

• This PR uses the correct branch, based on one of the following:
  • I made a change to the existing documentation and used the current branch.
• The documentation follows the Home Assistant documentation standards.

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[Copilot]

Pull request overview

This PR completes and polishes the LaMetric integration documentation to address remaining Integration Quality Scale documentation TODOs, expanding it into a full end-user guide.

Changes:

• Expanded the introduction with concrete use cases and added supported device and prerequisite details.
• Added a detailed supported functionality/entity breakdown, data update behavior, limitations, troubleshooting, examples, and removal instructions.
• Improved wording and consistency across actions/notification docs and renamed/relinked the notification sounds section.

[Copilot]

In the lametric.chart action documentation, device_id is described as sending a "message". Since this action displays a chart, this wording is misleading; update the description to refer to sending/displaying a chart (or notification) instead of a message.