feat(heroes): Add Turbo vs Normal win rate difference column

[Axelodo7]

Fixes #3393

Adds a sortable "Win % vs Normal" column to the Turbo tab of /heroes. It shows (Turbo W% − Overall W%) in percentage points, with a leading "+" for heroes relatively stronger in Turbo, e.g. Bristleback +6.2, Visage −5.4.

Changes

• src/components/Heroes/rankColumns.ts: new column in generateTurboTabColumns with a function-based sortFn computing winRateTurbo − winRatePub (no API change; both rates already exist on each row) and a displayFn that renders a signed value (\+ for positive) and – when either stat is missing.
• src/lang/en-US.json, src/lang/ru-RU.json: add hero_turbo_win_rate_diff localization (PT-BR / zh-CN are Crowdin-synced partial files and fall back to English).

Verified

• npm run typecheck passes
• npm run build passes (vite + tsc)
• Prettier clean on changed files

Note: as the issue mentions, the comparison is approximate because public vs turbo stats may not cover the exact same window (see #2826).

[howardchung]

Shouldn't we show - if it's negative?

[timoHaario]

toFixed returns a string and already returns negative values with the minus sign, this just adds the + for positive numbers.

However there's a small possible issue with the implementation above. Now the function first chooses the sign and then rounds the number, which for numbers close to 0 would result with either +0.0 or -0.0 . This could be a bug or a feature; user could read -0.0 as something that's slightly under zero (more informative), but if you want to keep it simpler so that each rounded value has the same representation, you'd want to round first and then choose the sign, like following:

displayFn: (_row: Row, _col: string, value: any) => {
    if (!Number.isFinite(value)) {
      return "–";
    }
    const diff = Number((value * 100).toFixed(1)) || 0;
    return `${diff > 0 ? "+" : ""}${diff.toFixed(1)}`;
  },