Replace galaxy background with animated underwater scene featuring water
depth gradient, pixel art sea floor (sand, seaweed, coral, starfish),
rising bubbles with water sway, and swimming pixel art fish. Also update
transcript-debug tool cards styling and add .claude-*/tasks/ to gitignore.
- Redesign all tool cards (Edit, Read, Bash, Grep, Glob, Write) to be
compact single-line headers with inline key info and toggle buttons
- Make cards and bubbles fully transparent with subtle color tints
- Remove borders, use only left accent bar per card type
- Color-code numbers: red for removals, green for additions/counts
- Simplify ToolResultBlock to render content directly without toggle
- Group consecutive assistant messages, showing header only on first
- Remove borders from assistant and user message bubbles
