feat(ui): Update small copy for consistency

[ovitrif]

Description

Implements small copy changes to increase consistency, using design v45 as reference:

• 1️⃣ Payment Received Event:
  Title changed to 'Received Bitcoin' (on-chain) and 'Received Instant Bitcoin' (Lightning) for consistency.
• 2️⃣ Recovery Phrase Back up Successful:
  Enhanced emphasis by highlighting 'secure place' and 'only way to recover' parts in bold, white text.
• 3️⃣ LN onboarding > Choose package:
  Updated body copy for consistency: 'Choose how much bitcoin you want to spend instantly.'
• 4️⃣ LN onboarding > Custom amount:
  Updated body copy for consistency: 'Enter the amount of bitcoin you want to spend instantly.'

Linked Issues/Tasks

Subtasks 5-8 from Bitkit Mobile Prototype v45

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Refactoring (improving code without creating new functionality)

Tests

• Detox test
• Unit test
• No test

Screenshot / Video

1️⃣	2️⃣	3️⃣	4️⃣

QA Notes

See above screengrabs.

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• To see the specific tasks where the Asana app for GitHub is being used, see below:
  • https://app.asana.com/0/0/1206354352883299
  • https://app.asana.com/0/0/1206354352883298
  • https://app.asana.com/0/0/1206354352883301