React Progress Bar (0–100 with Threshold Colors)

Challenge summary

Build a React progress bar for values 0–100 with +10%/−10% controls. Show the numeric percentage and keep the UI in sync with state.

What you'll practice

• Render the progress bar UI as the main component.
• Display the current progress percentage (e.g., "40%").
• Provide "-10%" and "+10%" buttons to decrease/increase progress by 10.
• React focus: derive classes from state and clamp values before render.
• Framework focus: React hooks (useState/useEffect), JSX event handling, and one-way props/state flow.

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