Add standalone Voting Portal Localization Studio

[GuyZequent]

Summary

• Adds @sequentech/voting-portal-loc-studio as a yarn workspace package with live-fidelity preview of voting portal screens
• Supports scene navigation (ballot, write-in, overvote, undervote, blank, invalid, etc.), hover-to-highlight i18n keys, click-to-edit, and election JSON import/export for presentation.i18n
• Includes embed exports (LocStudioEmbed, save result helpers) for a follow-up admin portal integration PR

Run locally

cd packages && yarn start:loc-studio

Opens at http://localhost:3010

Test plan

• yarn build:loc-studio completes successfully
• yarn start:loc-studio loads the studio UI
• Scene navigation switches between voter-facing screens
• Hover highlights i18n keys; click opens key editor
• Import election JSON and export updated presentation.i18n
• Double-click navigation works in preview pane
• Candidate boxes render without overlap in narrow preview

Parent issue: https://github.com/sequentech/meta/issues/13058

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