Add workflow guides and input UX

[Chidubemkingsley]

• closes Feature: Add a complete audit workflow tutorial #159
• closes Feature: Add a guide for interpreting coverage reports #158
• closes Feature: Add a clear-input action to path, function, and ramp fields #153
• closes Feature: Add a command length indicator for copied output #152

✅ Enhancement complete
The combined audit-workflow and guidance update is now in place across the app:

App.tsx: added the clear-input actions for the path, function, and ramp fields, the command-length indicator, and keyboard-accessible workflow guide panels.
styles.css: styled the new controls and guidance cards to match the existing interface.
App.test.tsx: added focused regression coverage for the new behavior.
README.md: documented the coverage report guide and the audit workflow tutorial.
package.json: included the missing DOM test dependency needed to run the suite reliably.

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