* fix: use theme class for valid contrast for light/dark, conversation group names, fix type issues
* fix: searchbar text contrast styling, closes#3469
* style: add theming for prompt cards, fix a11y contrast issues
* a11y: address placeholder text contrast issues in LLM controls section
* chore: Add conditional check for pull request repository in a11y workflow
* style: Update text color contrast to WCAG standard for placeholder and focus states in AssistantPanel components
91fc89076f