fix(mobile): correct sign-in language picker layering

[iscekic]

Summary

• Keep the sign-in globe behind toast notifications.
• Move the language sheet above Android and iOS keyboards.
• Show the standard translated search empty state.

Verification

• pnpm format
• pnpm typecheck
• pnpm lint
• pnpm check:unused
• pnpm test (5,899 tests)
• pnpm check:i18n (87 catalogs)

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (3 files)

• apps/mobile/src/components/agents/session-list-screen.tsx
• apps/mobile/src/components/agents/use-agent-session-list-data.ts
• apps/mobile/src/components/agents/session-list-screen.mounted.test.tsx

Previous Review Summary (commit 4278743)

Current summary above is authoritative. Previous snapshots are kept for context only.

Previous review (commit 4278743)

Status: No Issues Found | Recommendation: Merge

Files Reviewed (5 files)

• apps/mobile/src/components/kilo-chat/app-aware-keyboard-padding.tsx
• apps/mobile/src/components/language-picker-sheet.tsx
• apps/mobile/src/components/language-picker-sheet.mounted.test.tsx
• apps/mobile/src/components/login-screen.tsx
• apps/mobile/src/components/login-screen.test.ts

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_{Reviewed by grok-4.6 · Input: 67.4K · Output: 11.9K · Cached: 523.5K}

_{Review guidance: REVIEW.md from base branch main}