Use inputMode="decimal" instead of "numeric" on SettlementForm's and QuoteForm's amount inputs

[Jagadeeshftw]

📌 Description

SettlementForm (src/components/SettlementForm.tsx) and QuoteForm (src/components/QuoteForm.tsx) both set inputMode="numeric" on their amount <input>. On iOS and many Android keyboards, inputMode="numeric" shows a digit-only keypad with no decimal point key, while inputMode="decimal" shows the same digit keypad plus a decimal separator. Since both forms accept and validate fractional amounts (validate() in SettlementForm.tsx uses Number(amount) with no integer-only constraint, and Stellar amounts routinely carry decimal precision), mobile users currently have no easy way to type a fractional amount like 12.5 without switching keyboards or pasting.

🧩 Requirements and context

• Change inputMode="numeric" to inputMode="decimal" on the amount input in SettlementForm.tsx and on the amount input in QuoteForm.tsx.
• No change to the fields' existing validate()/parsing logic, which already accepts decimal strings via Number(amount).
• No visual/layout change beyond the mobile keyboard variant shown.

🛠️ Suggested execution

• Update the amount <input>'s inputMode attribute in src/components/SettlementForm.tsx and src/components/QuoteForm.tsx.
• Extend SettlementForm.test.tsx/QuoteForm.test.tsx with an assertion on the input's inputMode attribute, and confirm the existing decimal-amount test cases (if any) still pass.

✅ Acceptance criteria

• Both amount inputs use inputMode="decimal".
• Decimal amounts continue to validate and submit exactly as before.
• Test coverage asserts the corrected inputMode attribute.

🔒 Security notes

No new attack surface; a mobile input-affordance fix with no change to validation logic.

📋 Guidelines

• Minimum 95% test coverage
• Clear documentation
• Timeframe: 96 hours

[Jagadeeshftw]

Assigned to you. Reference this issue in your PR (e.g. Closes #234) when ready. Contributor chat: https://t.me/+vTbe0hOUKrFhNTJl