fix: avoid Miden Bank deposit FPI name collision

[huklaa]

Fixes the remaining method-name collision reported in #237.

The bank contract already uses get_depositor_balance, so the get_balance collision has been addressed on current main. This change handles the remaining deposit collision by renaming the exported bank component method to bank_deposit, updating the deposit-note FPI call, and aligning the Part 4 and Part 5 tutorial snippets, binding examples, WIT example, and flow diagrams with the collision-safe API.

Scope is intentionally focused: runnable contract code plus the directly corresponding tutorial pages. Transaction behavior is unchanged apart from the exported method name.

Validation: compared against current upstream main and checked the updated Miden Bank docs for stale account.deposit(...) / fn deposit binding examples in the affected Part 4–5 flow. Full Miden build was not run in this automation environment because the local GitHub CLI/toolchain is unavailable.