chore: address feedback on currency input field

[rolznz]

• Removed the outer bordered wrapper around the input + context rows; InputGroup now handles its own
  border and focus ring (focus only highlights the input).
• Moved contextRows out of the bordered area so they no longer look like an input.
• Added cursor-default to the contextRows wrapper to neutralize the inherited cursor: pointer from the
  global [data-slot="field"] rule.
• Always render the leading unit addon so "sats" displays when BIP-177 is not active (in addition to
  "₿", "BTC", or fiat symbol).
• Added a toast("Switched to BTC for decimal amount") when typing/pasting a decimal auto-switches the denomination to BTC.
• Replaced the embedded buttons' default focus ring with an inset 2px ring-inset ring-ring, plus peer-focus-visible so the adjacent divider borders go transparent on focus (cleaner ring, no clipped
  vertical stripes).
  • Rounded the rightmost button's right corners (rounded-r-md) so the inset ring follows the InputGroup's curve.
  • Changed the right-side button label to show "BTC" when BTC is active and the user's preferred sats
    unit (₿ for BIP-177, otherwise sats) when sats is active.

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[rolznz]

Review from @stackingsaunter - we don't want a duplicated BTC on left/right.