[Markets] Build user bet history view

[samuel2926i39-art]

Summary

Adds frontend/src/app/account/bets/page.tsx, a wallet-gated view listing bets for the connected address, sourced from GET /api/v1/blockchain/users/:user/bets.

Context

• Page requires a connected wallet before querying; a local useConnectedWallet hook stands in for Features/issue 4 featured markets api #77's shared wallet integration (same shape — address + account-change subscription) until that lands, then it's a one-line swap.
• The "no bets" case (error 142 BetNotFound) renders an empty-state message instead of an error, per feat: Add Virtual AMM (CPMM) for instant bet liquidity (#26) #36's error-mapping convention.
• Before: no account-scoped bet history existed.
• After: the page shows only the connected address's bets, paginated, and re-fetches automatically whenever the connected wallet account changes — never leaving the previous address's list on screen.

Testing

• Manually verified: no wallet connected → prompt to connect, no fetch fired.
• Manually verified: switching the mocked accountChanged event triggers a re-fetch and clears the prior list before the new one loads.
• Manually verified: 404/142 response renders "No bets found" rather than an error state.

Closes #1365

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