[i18n] Implement Full Platform Translation (Hindi/Bengali) Across All Pages - SSoC

[rhalbhavi]

Description

Fixes #94

Tasks
Audited all pages in src/pages/ and components in src/components/.
Replaced all hardcoded English text strings with the t('key') function from useTranslation().
Added the corresponding translation keys and values to the Hindi (hi.json), Bengali (bn.json), and English (en.json) translation dictionaries in src/i18n/locales/.
Ensured dynamic text (like error messages and API responses) is also handled gracefully.
Made sure it didn't delete the new GRADCAM features, etc.

Checklist

• npm run lint passes with no errors
• npm run build compiles without TypeScript errors
• python -m pytest passes (including new tests I added)
• No .env files, API keys, secrets, model weights, or __pycache__ in this diff
• Branch is rebased on main, not merged

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📥 Commits

Reviewing files that changed from the base of the PR and between 3f1987d and 30947af.

⛔ Files ignored due to path filters (1)

• package-lock.json is excluded by !**/package-lock.json

📒 Files selected for processing (36)

• .eslintrc.cjs
• .github/workflows/ci.yml
• README.md
• eslint.config.js
• index.html
• package.json
• src/App.tsx
• src/components/BottomNav.tsx
• src/components/Footer.tsx
• src/components/InstallPrompt.tsx
• src/components/Layout.tsx
• src/components/Navbar.tsx
• src/components/OnboardingTour.tsx
• src/components/PostHogPageView.tsx
• src/fusionInference.js
• src/i18n.ts
• src/i18n/i18n.ts
• src/i18n/index.ts
• src/i18n/locales/bn.json
• src/i18n/locales/en.json
• src/i18n/locales/hi.json
• src/lib/api.ts
• src/main.tsx
• src/pages/AnalysisDashboard.tsx
• src/pages/AuthPage.tsx
• src/pages/LandingPage.tsx
• src/pages/Leaderboard.tsx
• src/pages/MarketMapPage.tsx
• src/pages/ModeSelectPage.tsx
• src/pages/NotFound.tsx
• src/pages/PublicReport.tsx
• src/pages/ResultsPage.tsx
• src/pages/ScannerPage.tsx
• tsconfig.app.json
• tsconfig.node.json
• vite.config.ts

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