feat: add About page

[MEHWISH310]

Description

Adds the /about page referenced in the footer's "Explore" section, which previously linked to # (issue #134). The page explains what BallotIQ does, states its non-partisan mission, and credits the Google services powering the platform.

Closes #134

Changes

• Added src/app/about/page.tsx — new About page with:
  • Guided Path + Open Chat mode explanations
  • Non-partisan mission statement
  • "Powered by Google" section (Gemini, Firebase, Translation, Text-to-Speech)
• Updated src/app/page.tsx — footer "About" link now routes to /about instead of #

Design

• Matches the existing dark navy gradient theme (from-gray-950 via-blue-950 to-gray-950)
• Reuses the blue/green/purple accent badge style from the footer's "Secure / Non-partisan / AI Powered" strip
• Uses TranslatedText for i18n consistency with the rest of the app
• Fully responsive (stacks to single column on mobile)

Acceptance Criteria

• /about route created
• Matches existing dark theme (navy bg + blue/green/purple accent badges)
• Footer "About" link routes correctly
• Responsive on mobile

Screenshot

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