feat: Add Google Translate widget for 133-language support

[nichechristie]

Summary

• Adds a GoogleTranslate client component that dynamically loads the Google Translate Element API, enabling automatic translation of base.org into 133 languages
• Integrates the widget as a full-width banner at the top of the (base-org) layout, above the sidebar/content grid
• Updates CSP headers in next.config.js to allow translate.google.com and translate.googleapis.com in default-src, img-src, and frame-src

Motivation

Base is a global platform. Many users and builders are non-English speakers. This lightweight integration provides immediate multilingual access without requiring a full i18n implementation with manually maintained translation files.

The CSP connect-src already allows translate.googleapis.com (line 121 of next.config.js), and react-intl is installed but not actively used — this suggests translation support has been considered before.

Files Changed

File	Change
apps/web/src/components/Layout/GoogleTranslate/index.tsx	New 'use client' component
apps/web/app/(base-org)/layout.tsx	Import and render GoogleTranslate above the content grid
apps/web/next.config.js	CSP header updates for Google Translate domains

Design Details

• Widget loads asynchronously — no impact on initial page load performance
• Fades in via opacity transition only after the Google Translate script has initialized
• Includes a globe icon alongside the language selector for visual clarity
• Supports dark mode via Tailwind (dark:bg-gray-90, dark:text-gray-40)
• Uses aria-label for accessibility

Test plan

• Verify the translate widget renders at the top of the page on desktop and mobile
• Verify selecting a language translates the page content
• Verify no CSP violations appear in the browser console
• Verify dark mode styling works correctly
• Verify the widget does not block or interfere with the sidebar, mobile nav, or gas price dropdown
• Verify no layout shift occurs (widget fades in after load)

Closes #2932

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