feat(frontend): add WalletConnect support and chooser modal

[LSUDOKO]

Adds WalletConnect support alongside the existing injected MetaMask flow. Configured dynamically via NEXT_PUBLIC_WALLETCONNECT_PROJECT_ID. Includes a fully verified, dark-themed wallet chooser modal.

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PR created automatically by Jules for task 12039356297627897537 started by @LSUDOKO

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📥 Commits

Reviewing files that changed from the base of the PR and between 2960802 and 6ff3467.

⛔ Files ignored due to path filters (1)

• frontend/package-lock.json is excluded by !**/package-lock.json

📒 Files selected for processing (5)

• frontend/.env.example
• frontend/app/app/page.tsx
• frontend/next-env.d.ts
• frontend/package.json
• frontend/tsconfig.tsbuildinfo

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