feat: add per-user betting limit nudge

[pq198363-ops]

Summary

• Add a per-market userLimits store for daily limit, used amount, remaining allowance, and percentage helpers.
• Surface a compact daily allowance nudge on market cards with an accessible progressbar.
• Add focused store and widget tests plus documentation for the limit nudge behavior.

Closes #361

Validation

• node node_modules/jest/bin/jest.js --runTestsByPath app/state/__tests__/userLimits.test.ts "app/(marketing)/_components/__tests__/markets-widget.test.tsx" --runInBand
• node node_modules/eslint/bin/eslint.js "app/(marketing)/_components/markets-widget.tsx" "app/(marketing)/_components/__tests__/markets-widget.test.tsx" app/state/userLimits.ts app/state/__tests__/userLimits.test.ts
• node node_modules/typescript/bin/tsc --noEmit --pretty false --skipLibCheck app/state/userLimits.ts
• git diff --check

Full node node_modules/typescript/bin/tsc --noEmit --pretty false still fails on existing unrelated repository errors, including missing ResolutionPreview, ErrorBoundary, wallet modal symbols, badge variant typing, and existing PredictionCard identifiers.

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