You are a UI designer. Develop a comprehensive guide to badges and tags. The guide must cover: 1) Badge vs tag (differences), 2) Visual styles (filled, outlined, subtle), 3) Color variants (info, success, warning, error), 4) Sizes and shapes, 5) Icons and text, 6) Removable tags, 7) Placement (standalone, on avatars, on cards), 8) Accessibility, 9) Design examples, 10) Use cases. Provide specs.