fix(onboarding): name only boards that exist on the rewards slide

[ghozzza]

Closes #271

What changes

The onboarding rewards slide promised a priciest-plot board. That board (TYCOONS) was retired when CAMPAIGN replaced it (#224), so new players were told they could top a board that no longer exists.

Wording, as approved by @benibauer3 on #271:

Biggest empire, most land, or top the campaign board. Pick your flex. When a campaign runs, top players get paid in USDT.

It names only boards that exist, and "the campaign board" stays true whatever a campaign ranks by. "When a campaign runs … get paid" is unchanged.

Tests

Two copy-guard assertions in IntroScreen.test.tsx, next to the existing ones:

• the deck never says "priciest", anywhere (not only on this slide)
• the rewards slide names the campaign board

Control: with the old copy restored, both new tests fail (2 failed, 10 passed). With the new copy, 12/12 pass.

Preflight (lint, typecheck, test, as the required check runs them from the repo root): clean.

Before / after

390×844, /dev/intro-preview, rewards slide (4th dot active):

before (main)	after (this PR)
2026-09-25-before.png	2026-09-25-after.png

Before: "Biggest empire, most pixels, priciest plot." After: "Biggest empire, most land, or top the campaign board." Nothing else on the slide moves. Folder: https://drive.google.com/drive/folders/14JywcvFjTuRf1NNoiIDwsfzIoaUXoac7

🤖 Generated with Claude Code

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Project	Deployment	Actions	Updated
mondeto-web	Ready	Preview	Sep 25, 2026 6:30am UTC

[benibauer3]

Verdict: APPROVE. Mechanical tier (one string plus its guard test); reviewed head 45cbdb5, not behind main.

• The new copy is exactly the wording agreed on #271: "Biggest empire, most land, or top the campaign board. Pick your flex. When a campaign runs, top players get paid in USDT."
• IntroScreen.test.tsx: 12 tests pass.
• Mutation controls, all red as they should be: putting "priciest plot" back into the rewards slide, putting "priciest" on a different slide, and dropping "campaign board" from the rewards copy.
• Remaining tycoon/priciest matches under apps/web/src are internal code and tests, not player-facing copy.