fix(i18n): polish Spanish copy for product consistency

[sunnykid-02]

Overview

This PR polishes the Spanish (es) copy so the product reads natively and consistently across login, onboarding, wallet, and credit flows. Wording is standardized, tone is aligned across screens, labels are kept concise for mobile layouts, and the missing 404 strings are now translated through i18n.

Related Issue

Closes #68

Changes

🗣️ Spanish copy consistency (src/i18n/locales/es.ts)

• [MODIFY] Standardized wallet / credit / transaction terminology to consistent sentence case and tone, e.g. Cuenta congelada, deuda total a pagar, Retirar a mi wallet, retiro exitoso, nivel máximo alcanzado.
• [MODIFY] Improved phrasing for mobile readability, e.g. Conecta tu wallet primero, Cambia a {{wallet}} en Freighter, Instala la extensión o usa Albedo, una wallet web sin instalación.
• [MODIFY] Fixed typos / accents, e.g. con éxito, Conexión inestable, reputación, ¡Retiro exitoso!.
• [MODIFY] Aligned terminology with English equivalents used on the credit / withdraw screens.

🐛 404 translation (src/pages/NotFound.tsx)

• [MODIFY] Replaced hardcoded English Oops! Page not found / Return to Home with translation keys not_found.message / not_found.return_home (already defined in es.ts / en.ts).

Verification Results

npm run build

Note: the full production vite build is currently blocked in this environment by a pre-existing, unrelated dependency-resolution issue in @privy-io/* / react-aria (confirmed reproducible on a pristine upstream/main checkout with these changes stashed). The Spanish copy changes themselves introduce no new type or build errors — tsc --noEmit reports no errors in NotFound.tsx or es.ts.

## Acceptance Criteria

| Criterion | Status |
| --- | --- |
| PR updates the Spanish copy across the affected screens | ✅ Updated in `src/i18n/locales/es.ts` and wired through `NotFound.tsx` |
| Reviewer can compare English and Spanish and see consistent terminology | ✅ Terminology standardized to sentence case and aligned tone |
| Mobile layouts do not overflow because of longer text | ✅ Labels kept concise / shortened for mobile widths |

[vercel]

@sunnykid-02 is attempting to deploy a commit to the alankcr1-6443's projects Team on Vercel.

A member of the Team first needs to authorize it.

[drips-wave]

@sunnykid-02 Great news! 🎉 Based on an automated assessment of this PR, the linked Wave issue(s) no longer count against your application limits.

You can now already apply to more issues while waiting for a review of this PR. Keep up the great work! 🚀

Learn more about application limits