fix: correct restitution label from Damping to Coefficient of restitution

[TechGenius-Karan]

🔍 Description

The restitution input field in the BallGravity and BouncingBall simulation control panels was
incorrectly labelled ζ - Damping:. This is wrong on two counts:

• Wrong symbol: ζ (zeta) is the convention for the damping ratio in oscillatory systems (pendulums,
  spring-mass), not for collision elasticity.
• Wrong concept: This parameter controls how much kinetic energy is preserved after a bounce — that is the
  coefficient of restitution (e), not damping. Damping describes continuous energy loss during motion;
  restitution describes the energy ratio across a discrete impact.

The CollisionSimulation config already correctly labels the same variable as e - Restitution: — this PR
makes BallGravity and BouncingBall consistent with it.

Closes #189

---

✅ Checklist

• Verified that the project builds and runs locally (npm run dev)
• Ensured no ESLint or TypeScript warnings/errors remain
• Updated documentation, comments, or in-code explanations where needed
• Verified responsiveness across devices (desktop, tablet, mobile)
• Followed the CONTRIBUTING.md guidelines

---

🎨 Visual Changes (if UI-related)

This is a label-only change in the simulation control panel. The input behaviour, range, and step values are
unchanged.

Before:

ζ - Damping: (shown in BallGravity and BouncingBall control panels)

After:

e - Coefficient of restitution (0–1): (consistent with CollisionSimulation)

---

📂 Type of Change

• 🐛 Bug fix (non-breaking change that fixes an issue)
• ✨ New feature (non-breaking change that adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to change)
• 📝 Documentation update
• ♻️ Refactor / code quality improvement
• 🎨 UI/UX enhancement
• 🔒 Security improvement

---

🧩 Additional Notes for Reviewers

Only two lines changed across two config files — no logic, no range, no defaults touched:

• app/(core)/data/configs/BallGravity.js line 60
• app/(core)/data/configs/BouncingBall.js line 37## 🔍 Description

The restitution input field in the BallGravity and BouncingBall simulation control panels was
incorrectly labelled ζ - Damping:. This is wrong on two counts:

• Wrong symbol: ζ (zeta) is the convention for the damping ratio in oscillatory systems (pendulums,
  spring-mass), not for collision elasticity.
• Wrong concept: This parameter controls how much kinetic energy is preserved after a bounce — that is the
  coefficient of restitution (e), not damping. Damping describes continuous energy loss during motion;
  restitution describes the energy ratio across a discrete impact.

The CollisionSimulation config already correctly labels the same variable as e - Restitution: — this PR
makes BallGravity and BouncingBall consistent with it.

Closes #189

---

✅ Checklist

• Verified that the project builds and runs locally (npm run dev)
• Ensured no ESLint or TypeScript warnings/errors remain
• Updated documentation, comments, or in-code explanations where needed
• Verified responsiveness across devices (desktop, tablet, mobile)
• Followed the CONTRIBUTING.md guidelines

---

🎨 Visual Changes (if UI-related)

This is a label-only change in the simulation control panel. The input behaviour, range, and step values are
unchanged.

Before:

ζ - Damping: (shown in BallGravity and BouncingBall control panels)

After:

e - Coefficient of restitution (0–1): (consistent with CollisionSimulation)

---

📂 Type of Change

• 🐛 Bug fix (non-breaking change that fixes an issue)
• ✨ New feature (non-breaking change that adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to change)
• 📝 Documentation update
• ♻️ Refactor / code quality improvement
• 🎨 UI/UX enhancement
• 🔒 Security improvement

---

🧩 Additional Notes for Reviewers

Only two lines changed across two config files — no logic, no range, no defaults touched:

• app/(core)/data/configs/BallGravity.js line 60
• app/(core)/data/configs/BouncingBall.js line 37
  Both changed from "ζ - Damping:" → "e - Coefficient of restitution (0–1):".

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🎉 This PR is included in version 3.29.0 🎉

The release is available on GitHub release

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