[WIP] Refactor smart-climate-card.js for improved maintainability

[Copilot]

Thanks for asking me to work on this. I will get started on it and keep this PR's description up to date as I form a plan and make progress.

Original prompt

The smart-climate-card.js needs code refactoring and cleanup to improve maintainability and performance:

Issues to address:

1. Hardcoded constants: Magic numbers (30px, 11px, 480, etc.) should be CSS/JavaScript constants
2. Code duplication: Similar styles are repeated in .away-delay-row and .timer-row - consolidate
3. State management: State variables should be better organized and documented
4. Magic values: Values like 480 (8 hours in minutes), 25 (max temp), 5 (min temp) should be named constants
5. Helper methods: Add proper JSDoc comments for clarity
6. Error handling: Add validation for attributes and service calls
7. CSS consolidation: Reduce redundant CSS rules and use better organization
8. Code organization: Better separation of concerns between logic and UI rendering

Requirements:

• Extract hardcoded values to named constants at the top of the file
• Consolidate similar CSS rules using shared classes
• Add JSDoc comments to all methods
• Improve variable names for clarity
• Add input validation for critical attributes
• Organize code in logical sections (properties, lifecycle, rendering, helpers, styles)
• Ensure the refactored code maintains 100% compatibility with current functionality
• Add comments explaining complex logic (especially date/time formatting)

The refactored code should be production-ready with better maintainability and documentation.

This pull request was created from Copilot chat.

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