Persist locale across reloads and tabs

[Kalebtron1]

Why this matters

A locale switch should survive refreshes and stay consistent across tabs.

Problem

Locale state can be lost depending on session behavior.

Scope

• Persist the selected language in local storage.
• Restore it on startup.
• Keep tabs consistent when the app is reopened.

Setup Steps

• Clone the repository and run npm install at the repo root.
• Change the language in npm run dev and reload the page.
• Open a second tab to confirm the saved locale is reused.

File Paths

• src/App.tsx
• src/components/WalletSetupModal.tsx
• src/pages/Login.tsx
• src/pages/Onboarding.tsx

Implementation guidance

• Hook into the existing selector or locale state.
• Load the saved locale before the app renders meaningful UI.
• Keep the persistence logic isolated from unrelated code.

Acceptance criteria

• Locale survives refresh and new tabs use the saved value.
• Reviewer can confirm the saved language without reselecting it.
• Fallback locale still works if the stored value is invalid.

Validation

• Change the locale, reload, and confirm persistence.
• Open a second tab and verify the same locale is used.

PR requirements

• Include Closes #70.
• Include before/after behavior notes.

Complexity

• Medium (100 points)

[elijahbok14-sudo]

@elijahbok14-sudo has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hi can i get to work on this

ℹ️ Repo Maintainers: To accept this application, review their application or assign @elijahbok14-sudo to this issue.

[Elizzy01]

@Elizzy01 has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hi there, I can take care of this ASAP.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Elizzy01 to this issue.

[yellowmam77]

@yellowmam77 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hi Maintainer! I'm a senior developer with experience building high-quality, production-ready software. I'd love to take on this issue and deliver a clean, well-tested solution that aligns with the project's standards. Please assign it to me—I'm ready to get started and contribute effectively.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @yellowmam77 to this issue.