Rename energy 'Today' button to 'Now'

[karwosts]

Proposed change

Requested by Matthias: #18743 (comment)

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New feature (thank you!)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Example configuration

Additional information

• This PR fixes or closes issue: fixes 'TODAY' button on Energy Dashboard does not switch back to today #18743
• This PR is related to issue or discussion:
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
• There is no commented out code in this PR.
• Tests have been added to verify that the new code works.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io

Summary by CodeRabbit

• Enhancements
  • Updated the label for the current time period selection button from "Today" to "Now" in the energy period selector.

This change ensures a more intuitive understanding for users selecting the current time period.

[piitaya]

Thank you!