feat(mobile): empty states + logger + notif tap routing + locale form…

[Cedarich]

• Title: Mobile: empty state illustrations, centralized logger, notification tap routing, locale formatting
• Body:
• Implements Add empty state illustrations #298 by adding SVG-based EmptyState UI and applying it to groups/transactions/notifications list screens.
• Implements Create debug logging utility #294 by introducing a centralized logger with levels, env-based filtering, consistent formatting, and optional dev persistence.
• Implements Handle background push notification tap navigation #276 by ensuring notification tap navigation works from background/cold start via response listeners + safe route parsing/fallback.
• Implements Format dates and numbers according to device locale #291 by formatting dates and XLM amounts via Intl using device locale and removing direct toLocaleDateString() usage.

closes #298
closes #294
closes #291
closes #276

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