Health-adjusted round income visibility + export backfill; update completion CTA

[Spbd1]

Motivation

• Improve game logic transparency by making it clear that lower health reduces round earnings and ensuring round-level income data is present in exports for analysis.
• Preserve existing scoring semantics (ROUND_INCOME_POINTS as base) while making health-based adjustments observable and reproducible for replay and exports.
• Prevent misleading UI text that implies additional survey questions after the game summary by clarifying the post-round/finish CTA.

Description

• Added an in-game helper note and post-round breakdown so players see that lower health reduces later-round earnings and the per-round income used; changes in components/HiddenCostGame.tsx include the helper note, a result breakdown line, and updated CTA label to "Continue to score table" for the primary flow.
• Kept the existing health→income rule and ROUND_INCOME_POINTS as the base and used healthBefore when computing a round's roundIncome according to the established multipliers (≥90: 100%, ≥75: 85%, ≥50: 65%, ≥25: 40%, <25: 20%), with the saved round storing roundIncome, baseRoundIncome, and healthIncomeMultiplier.
• Backfilled missing per-round income fields at export time without overwriting stored data by mapping game.rounds (and replayGame.rounds) through withRoundIncomeFields in utils/researchMetrics.ts and bumped the export constants to RESEARCH_EXPORT_VERSION = "prototype-1.3" and RESEARCH_SCHEMA_VERSION = "hidden-cost-game-research-schema-8".
• Preserved replay flow and session compatibility by not changing storage keys or destructive behavior; per-round fields remain optional in types/research.ts so older exports remain accepted.

Testing

• Ran npm run typecheck and the TypeScript check completed successfully.
• Ran npm run lint and ESLint completed with no warnings or errors.
• Ran npm run build (Next.js production build) and compilation / page generation completed successfully.

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Codex Task