Fix/splash screen and mint selection onboarding refinement

[swedishfrenchpress]

Onboarding and mint selection redesign

Summary

Redesigned the mint selection onboarding screen to introduce a clear two-section layout (Default Mint + Popular Mints), improved bottom sheet interactions, and polished the welcome screen.

Demo

Sunmi POS:

sunmi-v2-new-mint-onboarding.mp4

Pixel 6a:

pixel-6a-new-mint-onboarding.mp4

Changes

Mint selection screen — new structure

The mint selection screen now has two distinct sections:

• Default Mint — The single mint that connects to Lightning and holds the user's bitcoin. Shown at the top with a filled star icon and a Lightning badge. Only one mint can be the default at a time.
• Popular Mints — Additional mints the user can accept ecash from. Each has an unfilled star icon and a green checkmark toggle. Tapping the star on a popular mint swaps it into the default slot (the previous default moves down to popular mints with a checkmark enabled).

On first launch, the app randomly assigns one of the popular mints as the default to avoid centralization risk around any single mint.

Manually added mints become the default

When a user adds a new mint manually — either by typing a URL or scanning a QR code — that mint is automatically set as the default. The previous default moves to the popular mints list. The assumption is that if a user goes through the effort of adding a mint themselves, they want it as their primary.

Star tap target expanded

Star ImageView increased from 24×24dp to 44×44dp with 10dp padding (visual icon stays 24dp). Row paddingStart reduced from 16dp to 6dp to maintain visual alignment. marginEnd removed since the star's right padding now provides spacing. This fixes accidental checkbox toggles when trying to tap the star.

Drop shadow removed from Continue button

Flattened the button style, no elevation or shadow.

Welcome screen

• Terms of Service / Privacy Policy link styling — Removed blue color and underline from legal links. Now uses heavier font weight (semibold) in the same color as surrounding text so they still read as tappable without looking like default web links.
• Drop shadow removed from Get Started button — Same flat button treatment as Continue.

Add a Mint bottom sheet

• Keyboard interaction fixed — Bottom sheet now adjusts position when the keyboard opens so the input field and action buttons stay fully visible above the keyboard, instead of the keyboard overlapping the sheet.
• Loading state improved — Replaced the centered spinner that caused layout shift with an inline loading state ("Adding mint...") that maintains layout dimensions. No more content jumping around during mint URL validation.

Known issue: Popular Mints clipping on small screens (Sunmi)

sunmi-issue.mp4

On the Sunmi POS and similarly small-screen devices, if there are 3+ popular mints, the last mint in the list is not visible without scrolling. Unlike slightly larger screens where a partial row peeks out and hints at more content, on the Sunmi the third mint is completely hidden.

Solutions considered:

• Reduce vertical padding between mint rows — Rejected. The spacing is already tight and reducing it further would hurt readability and tap accuracy.
• Add a "+ X more" count label — Rejected. There isn't enough vertical space between the mint list, the "+ Add a different mint" button, and the Continue button to fit another text element without making the layout feel cramped.
• Horizontal carousel / chips layout — Rejected. Too large of a layout change for a minor edge case, and would break consistency with the rest of the onboarding flow.
• Bottom fade/gradient scroll hint — Considered but deferred. Adds visual complexity for something that really isn't a huge issue. User can always change their mint settings.

Decision: Keeping as-is for now. The Sunmi is a niche merchant device with known screen constraints. The list is scrollable and all mints are reachable — the discoverability gap is a tradeoff we're accepting for now rather than introducing layout complexity that affects all devices. Will revisit if merchant feedback indicates this is causing real friction.