fix: nav to android settings for bitkit app

[ovitrif]

This PR updates navigation to android settings into links that try to open directly the OS settings page for the Bitkit app if possible, falling back to the OS general settings page if not.

It also fixes two tiny issues in the Send flow and ensures the received transaction sheet closes the other sheets before it gets displayed, so it doesn't overlay them.

Description

Fixes

1. feat: open settings for bitkit app if possible
2. fix: close other sheets before showing received tx sheet
3. fix(send): send success bottom navbar padding
4. fix(send): nav back on fiat amount tap in confirm screen

Preview

Settings for App	Send Fiat Tap	Send Success Navbar Padding
fix_app_settings.mp4	fix_send_fiat_tap.mp4	fix_send_success_nav_padding.mp4

QA Notes

Tests

1. Un+Re-install app → Scan → Don't Allow → Open Phone Settings → expect Bitkit app info
2. Get LN funds → Receive → Pay LN invoice from other device → expect 'Transaction Received' sheet displayed → Close → expect no more 'Receive QR' sheet
3. Send → Proceed to Pay → expect no gray border on the bottom of Send Success
4. Send → Scan → Enter amount → on Confirm tap the big amount text → expect nav back to amount → tap big amount text to switch to fiat → on Confirm tap the big fiat amount text → expect nav back to amount again

[jvsena42]

Tested on emulator