Fix/android swap screen UI glitches 108

[jonathanchw]

Android Swap — UI polish & iOS parity

A set of focused improvements to the Android swap and confirm screens, closing visual and interaction gaps with iOS.

What's changed

• Confirm screen grouping — Wallet, Network, and Details now render as a single grouped card, matching iOS where all three share one section.
• Network fee sheet header — added centered title and leading X close button, matching iOS NetworkFeeScene.
• Fee rate emojis — aligned with iOS Emoji.FeeRate: ⏱️ slow · 💎 normal · ⚡️ fast (was 🐢 / 🚀).
• Provider picker — consolidated into the swap details sheet with an animated slide transition and a themed header.
• Swap CTA visibility — hidden until quote input is present; buttons disabled during loading instead of showing double indicators.
• Swap details sheet — deferred until IME is dismissed to prevent layout jumps.
• 25 / 50 / 100% pay shortcuts — pill bar appears above the keyboard when the pay field is focused, replacing the Swap button. Tapping a pill fills the pay amount and triggers a new quote. Matches iOS InputAccessoryView.

close #108

Files changed

SwapScene.kt · SwapScreen.kt · SwapViewModel.kt · SwapDetailsComponents.kt · SwapAction.kt · SwapUiState.kt · ConfirmScreen.kt · FeeDetails.kt · DialogBar.kt · FeeRateUIModel.kt

[jonathanchw]

Closed, as it has been split into four smaller
#171 #172 #173 #174