docs: sync recent library and platform behavior

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Summary

• fix a broken internal link and stale compiler/ESLint examples
• document the webpack commands required for Next.js automatic JSX injection
• document incremental static data-export reuse for MDX, TypeScript, and JavaScript
• correct recently touched grammar and billing copy

Findings by severity

• Broken: invalid Dashboard context-guide link in the docs style guide
• Wrong: reversed Vite plugin order, underspecified Next.js 16 webpack requirement, stale legacy import-source guidance, and incorrect ESLint config import
• Polish: grammar and spacing corrections

Verification

• built a fresh Next.js 16.2.10 app with gt-next@11.0.11 and @generaltranslation/compiler@1.3.32 using webpack
• confirmed Turbopack skips injection with the documented warning
• built a fresh Vite 8.1.5 app with gt-react@11.0.11 and confirmed automatic JSX injection in output
• validated the ESLint example with the published React Core linter
• ran content validator tests, link validation, unsafe HTML validation, and the full 434-page docs build