fix: Update CI configuration for renamed tests folder

fix: Fix ShellCheck SC2199 errors in test_helper.bash

refactor: Rename test folder to tests for consistency

refactor: Add global prefix support and simplify Dracula integration

feat: Rename label to prefix and add currency symbol support

docs: Improve documentation and simplify examples

fix: Fix JSON parser to correctly handle modelBreakdowns

docs: Update documentation to reflect pure bash implementation

test: Standardize JSON formatting and remove unused MOCK_JSON

fix: Improve JSON parsing for multi-entry data

feat: Custom format support for Dracula theme without Claude prefix

refactor: Move dracula-ccusage.sh to scripts directory

fix: Force copy dracula-ccusage.sh during installation

fix: Update README examples and Dracula integration

feat: Add automatic Dracula theme integration