feat(frontend): build portfolio page, bet history table, countdown ti…

[Dafuriousis]

closes #777
closes #778
closes #776
closes #779

…mer, and fighter card

BetHistoryTable (src/components/bet/BetHistoryTable.tsx)

• Add filter tabs: All / Active / Won / Lost / Pending Claim
• Add sortable columns: Amount (XLM) and Date with asc/desc toggle
• Add pagination (10 rows/page) with prev/next controls and row count
• Add columns: Market (fighter names), My Bet, Amount, Odds, Status, Payout, Date, Action
• Claim button on Pending Claim rows calls onClaim(market_id)
• Accept optional markets map for resolving fighter names from market_id

CountdownTimer (src/components/ui/CountdownTimer.tsx)

• Rewrite to use own setInterval instead of useMarketCountdown hook
• Format as DD:HH:MM:SS, updating every second
• Clean up interval on unmount
• Show 'Betting Closed' when target time is reached
• Accept label prop for context (e.g. 'Betting closes in')
• Rename prop scheduled_at -> targetDate; update callers in MarketCard and MarketDetailContent

FighterCard (src/components/market/FighterCard.tsx) [new]

• Show fighter name, implied odds (%), and pool amount in XLM
• Optional photoUrl via next/image with 🥊 emoji fallback
• Trophy icon overlay when isWinner=true
• Amber ring border + 'Your pick' badge when isUserBet=true

Portfolio page (src/app/portfolio/page.tsx)

• Add BettorStats summary: Total Staked, Won, Lost, Win Rate, Pending Claims count
• Add Claim All button iterating pending_claims deduped by market_id (one tx each)
• Redirect to ConnectPrompt when wallet not connected
• Show empty state with link to browse markets when no bets placed
• Merge all bets (pending + active + past) into single BetHistoryTable with markets map

Closes

Closes #

What this PR does

Testing

Screenshots (frontend changes only)

Checklist

• I have read docs/contributing.md
• My code follows the naming conventions in the guidelines
• I have added or updated tests for my changes
• All tests pass locally (cargo test / npm test)
• Lint passes (cargo clippy / npm run lint)
• No console.log or unwrap() left in production paths
• No secrets committed