[Kamitoad]

Summary

• Preserve the existing local money-field fix for issue Preserve money-field input while typing #23, including partial input, blur formatting, explicit invalid-state feedback, and save gating.
• Correct Android backup documentation and distinguish implemented features from pending physical-device acceptance and unsupported webserver migration.
• Add 17 rendered React interaction tests and 20 shared adapter characterization cases.
• Extract receipt review, item cards, field controls, status indicators, and icons without redesigning the German mobile-first UI.
• Share equivalent validation rules and UI-facing API contracts while keeping web/Android persistence and backup formats separate.

Verification

• pnpm check: 126 tests in 15 files passed, with TypeScript checks.
• pnpm build: passed; existing non-blocking Zod/Rollup annotation warnings remain.
• git diff --check: passed.
• Targeted Opera smoke checks at 412x915 and 360x800: no horizontal overflow, money correction/invalid-input gating, synthetic receipt create/save/edit with no duplicate.
• The user additionally confirmed the development UI worked in their phone browser over Wi-Fi.
• No physical Android app acceptance, virtual-keyboard/touch regression pass, offline persistence, or native backup/update acceptance was performed.
• No database migrations or backup-format changes.

Distribution

This source PR does not distribute an APK. After merge, explicitly request the durable-signed Android installable update workflow on main, then complete the real-device checklist before relying on native storage or backups.

Refs #23. Device-specific acceptance remains separate; do not infer acceptance from simulated native tests or web-browser feedback.