[WIP] make card_mod style consistently ... still buggy

[Copilot]

• Analyzed the repository structure and identified key files
• Examined sticky.yaml implementation using card_mod with positioning
• Reviewed transparent.yaml theme with sticky class styling
• Studied rooms.yaml to understand how sticky bars are used
• Identified potential race condition with card_mod CSS application
• Create test to reproduce the inconsistent styling issue
• Fix the sticky positioning and z-index application in sticky.yaml
• Enhance CSS reliability with !important declarations and fallbacks
• Add timing safeguards to ensure styles persist after DOM updates
• Test the solution and verify consistent styling

Problem: Card_mod styling for sticky headers/footers is inconsistently applied, causing styling to disappear until page reload. This appears to be a timing/race condition issue where the CSS is applied but then overridden during DOM updates.

Root Cause: The :host styles in sticky.yaml card_mod may not be getting applied consistently due to timing issues during DOM rendering and updates.

Solution Approach: Make the CSS more robust with stronger selectors, !important declarations, and ensure proper timing of style application.

Fixes #19.

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