🩺 Diagnostic-Page | App Diagnostics & RPC Node Performance Debug Panel

[milah-247]

Summary

• Adds /diagnostics (src/app/diagnostics/page.tsx): an internal debug dashboard with commit SHA, SDK versions (Next.js, React, @stellar/stellar-sdk, @stellar/freighter-api, read from package.json), and the active network target/passphrase.
• Commit SHA is resolved in next.config.ts at build time — VERCEL_GIT_COMMIT_SHA when present, otherwise git rev-parse --short HEAD, falling back to "dev" — and exposed via NEXT_PUBLIC_COMMIT_SHA.
• A ping test suite for Horizon and Soroban RPC, built on the existing useRpcHealth hook (no new ping logic needed).
• Live WebSocket connection status sourced from the app's real WebSocketManager singleton (subscribeToStatus/getConnectedStatus) rather than guessing at global WebSocket instances.
• A localStorage inspector listing keys and sizes.
• A one-click "Clear App Cache & Reset State" action (clear() from src/utils/storage.ts) that wipes storage and reloads.

Technical Requirements Addressed

• Display current commit SHA, SDK versions, and active network target details
• Ping test suite evaluating response times across public Horizon and Soroban nodes
• One-click "Clear App Cache & Reset State" utility for troubleshooting

Files Changed

• src/app/diagnostics/page.tsx (new)
• next.config.ts
• src/config/env.ts

Testing

• npx tsc --noEmit — no new type errors introduced.
• npx eslint on all changed files — clean.
• npx next build currently fails on main for unrelated pre-existing reasons (src/lib/queryClient/src/lib/persister missing, ErrorBoundary not exported from @/components/ui) — not touched by this PR; verified via tsc/eslint instead.

Closes #628

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