Turn off Node's own localStorage in Vitest workers

[mgballou]

• Passed --no-experimental-webstorage to Vitest fork workers in the root vitest.config.ts so jsdom's localStorage is not shadowed by Node 25+'s own
• Fixes 110 failures across App.test.tsx, BuyRail.test.tsx, onboarding.test.ts, useSound.test.ts and useBuyQuantity.test.ts under Node 26; Node 22 accepts the flag and runs unchanged

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[mgballou]

Local verification: current and green

Main da92b00319bcbb46bfc074e9bb81a221f7c6c1b4 is already included; merging origin/main reported already up to date. Verified head: 9dc8c17ee1e17580c1db2b36a8f5955eba100e8d. HTTPS push reported everything up to date.

Used Node 26.7.0 and pnpm 11.18.0. Commands ran in an isolated worktree; PATH began with /opt/homebrew/bin. Every check/build had a 900-second timeout and used rtk proxy.

Command	Exit	Result
pnpm install --frozen-lockfile	0	Locked dependencies installed
pnpm check	0	Typecheck, lint, formatting; 63 files / 1371 tests passed
NODE_OPTIONS=--no-experimental-webstorage pnpm check	0	README #20 command; 63 files / 1371 tests passed
pnpm build	0	Production build succeeded; no tests in this command

This branch passes under Node 26 without requiring the environment flag. Draft state unchanged. No PR merged.