Add FrontendColors enum generated from the frontend theme

[bgoncal]

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Summary

Adds a FrontendColors enum mirroring the frontend theme color custom properties (color.globals.ts), generated by Tools/BuildFrontendColors.py, plus a weekly workflow that regenerates it and opens a PR when the palette changes.

Screenshots

N/A – no user-facing UI change.

Link to pull request in Documentation repository

Documentation: home-assistant/companion.home-assistant#

Any other notes

The generated file is committed; run Tools/BuildFrontendColors.py to regenerate locally.

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Adds an automated pipeline to mirror Home Assistant frontend theme CSS custom properties into a generated Swift enum (with light/dark raw values and runtime color resolution), plus CI automation to keep it updated.

Changes:

• Add Tools/BuildFrontendColors.py generator that fetches/parses color.globals.ts and writes FrontendColors.swift.
• Add Swift helpers to resolve hex/rgb(a)/var() CSS values into SwiftUI.Color, plus unit tests.
• Add a scheduled GitHub Actions workflow to auto-regenerate and open a PR when colors change.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
Tools/BuildFrontendColors.py	New generator script that fetches/parses frontend theme colors and renders Swift output.
Sources/HADesignSystem/Sources/Colors/FrontendColors.swift	Generated enum + light/dark raw-value mappings for CSS custom properties.
Sources/HADesignSystem/Sources/Colors/FrontendColors+Color.swift	Adds runtime parsing/resolution for CSS-like color values into SwiftUI colors.
Tests/Shared/DesignSystem/FrontendColorsTests.swift	Validates raw values and selected resolution behaviors (hex, var(), fallback, rgba).
.github/workflows/update_frontend_colors.yml	Scheduled workflow to regenerate the file and open an automated PR.