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

[Copilot]

• Analyze repository structure and understand the issue
• Identify the root cause: CSS syntax error in transparent.yaml theme
• Fix the CSS syntax error in transparent.yaml (line 58: remove stray 'c')
• Test the fix by validating YAML syntax
• Verify no other CSS syntax issues exist in the theme file
• Ensure the sticky card configuration remains intact

Issue: Inconsistent card_mod styling in sticky headers/footers with mushroom chip badges. Sometimes styling doesn't apply and requires page reload.

Root Cause: CSS syntax error on line 58 of themes/transparent.yaml - there's a stray 'c' character at the end of padding-inline: 4px;c which breaks CSS parsing and causes inconsistent style application.

Solution: Remove the stray 'c' character to fix CSS parsing.

Fixes #19.

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