Redesign the native wallet for desktop and mobile

[krutftw]

What changed

• redesign the Tauri wallet as a responsive native app instead of a phone-sized page in a desktop window
• keep wallet status and top-level navigation visible throughout desktop payment flows
• simplify onboarding, backup, receive, send, review, activity, and settings copy
• preserve the wallet-plugin boundary, background locking, local-only assets, and 48 px targets
• add desktop and phone screenshot regression coverage
• record the product and design contracts so later screens stay consistent

Verification

• go test ./...
• go vet ./...
• 15 mobile bridge and UI contract tests
• 19 desktop package and boundary tests
• responsive Playwright smoke across 18 phone and desktop screens
• 9 Rust wallet shell tests with wallet-only
• wallet-only Windows release build (--no-bundle)
• live wallet-only setup/activity smoke with no miner surface

The design audit flagged the receive QR image because it was created without a source in the static HTML. The QR element is now created only after the native bridge returns a real address and image.

[gemini-code-assist]

Caution

The consumer version of Gemini Code Assist on GitHub has been sunset. All code review activity has officially ceased.

[chatgpt-codex-connector]

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