- Implement /student_card_class_barcode_download route to filter student cards by class
- Dynamically extract unique class names from the database for frontend selection
- Update student_cards_admin.html to replace the text input with a class selection dropdown
- Updated background colors across various templates to use CSS variables for better theming support.
- Replaced hardcoded colors with variables like `var(--ui-surface)` and `var(--ui-surface-soft)` for backgrounds.
- Adjusted text colors to use `var(--ui-text)` for improved readability and consistency.
- Enhanced the theme toggle functionality in the base template to dynamically change theme colors based on user preference.
- Ensured that all relevant templates reflect the new theming approach for a cohesive user experience.
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