fix: polish payment request ui

[ovitrif]

This PR polishes Payment Request screens so spacing, contact rows, amount keypad, and success layout match existing Bitkit (Contacts, Receive amount, backup success) instead of the GPT layout from #1172.

Figma is intent. Existing Bitkit components win when Figma disagrees. No flow or logic changes.

Description

• Aligns contact rows with Contacts (Text13Up + BodyMSB, 24dp vertical).
• Rebuilds amount edit on Receive amount (SheetTopBar 16dp, UnitButton, full NumberPad).
• Uses Receive note spacing (Caption13Up 16dp, 4-line note).
• Pins sent check + copy to backup success (Display then check weight(1f) then card + OK).
• Shows contact name as card title and note as subtitle.

Preview

Screen	Figma	Before	After
List
Recipient
Recipient invoice
Amount empty
Amount filled
Details
Details contact
Sent

QA Notes

Manual Tests

• 1. Figma List → Requests list: implemented matches Figma.
• 2. Figma Recipient → Choose Recipient: implemented matches Figma.
• 3. Figma Recipient invoice → Choose Recipient from invoice: implemented matches Figma.
• 4. Figma Amount empty → Amount: implemented matches Figma.
• 5. Figma Amount filled → Amount with value: implemented matches Figma.
• 6. Figma Details → Payment Request details: implemented matches Figma.
• 7. Figma Details contact → Payment Request details with contact: implemented matches Figma.
• 8. Figma Sent → Request sent: implemented matches Figma.

Automated Checks

• Instrumented tests passed: CreatePaymentRequestScreenTest.kt, PaymentRequestsScreenTest.kt.
• just compile and just lint passed locally.
• CI: standard compile, unit test, and detekt checks run by the PR bot.