Allow decimal values for bank deposits and withdrawals

[Copilot]

Summary

This PR enables users to deposit and withdraw decimal amounts (e.g., $10.25, $0.99) at the bank, instead of being limited to whole dollar amounts only.

Changes

Previously, the bank's deposit() and withdraw() methods used int() to parse user input, which would raise a ValueError for any decimal input like "10.50". This PR changes the input parsing to use float() and updates all money formatting to use %.2f instead of %d for consistency.

Modified Files

src/location/bank.py:

• Changed input parsing from int(input("> ")) to float(input("> ")) in both deposit() and withdraw() methods
• Updated error messages to use %.2f formatting (e.g., "Try again. Money: $%.2f")
• Updated success messages to use %.2f formatting (e.g., "$%.2f deposited successfully.")

tests/location/test_bank.py:

• Added test_deposit_with_decimal() - validates depositing $10.25 from $100.50
• Added test_withdraw_with_decimal() - validates withdrawing $10.50 from $100.75

Testing

All 64 tests pass, including the 2 new tests that specifically validate decimal input handling. The changes maintain backward compatibility - integer inputs like "10" still work correctly.

Example Usage

Before: User enters 10.50 → ValueError: invalid literal for int()
After: User enters 10.50 → Successfully deposits/withdraws $10.50

This aligns the bank interface with the existing game mechanics, as player.money and player.moneyInBank are already stored as floats (e.g., moneyInBank starts at 0.01), and the prompts already display values using %.2f formatting.

Fixes #[issue_number]

Original prompt

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This section details on the original issue you should resolve

<issue_title>Allow the user to use decimals when depositing/withdrawing at the bank.</issue_title>
<issue_description></issue_description>

Comments on the Issue (you are @copilot in this section)

Fixes #15

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