feat(client): implement reactive key ownership percentage display wit…

[godamongstmen897]

Summary

Closes #374. Introduces a front-end math utility layer and UI helper to calculate, format, and render a connected wallet's exact key holding ownership percentage relative to a creator's dynamic circulating supply.

What Changed

• Defensive Calculation Engine (ownership.utils.ts): Authored safe floating-point percentage math that cleanly intercepts zero-supply edge cases and formats readable strings.
• Reactive State Mapping (LandingPage.tsx): Tied the dashboard stat bar and mobile holdings indicator to read reactively from featuredCreator.creatorShareSupply instead of hardcoded demo integers.
• Robust Verification Suite (ownership.utils.test.ts): Implemented unit tests checking precision rounding, zero-division blocks, and overflow thresholds.

Testing & Validation

• Confirmed a flawless execution cycle across all 11 calculation edge cases locally via pnpm test.
• Verified zero layout regression or TypeScript compile errors during production compilation passes.

Closes #374

[drips-wave]

@godamongstmen897 Great news! 🎉 Based on an automated assessment of this PR, the linked Wave issue(s) no longer count against your application limits.

You can now already apply to more issues while waiting for a review of this PR. Keep up the great work! 🚀

Learn more about application limits