Fix: Date Picker, Mobile Voting UI, NYC Token Decimals, and Hardware Wallet Suppor

[winsznx]

This PR addresses four reported issues to improve the user experience and reliability of the Ballot application.

Changes:

Improved Voting Period UX (Issue #2)

Replaced manual Block Height inputs with datetime-local date pickers in the Poll Builder.
Added calculateBlockHeightFromDate utility to automatically estimate block heights based on selected dates.

Mobile UI Fixes (Issue #1)
Fixed responsive CSS in styles/Poll.module.css to ensuring the "Cast Your Vote" section is visible on mobile devices.
Scoped the hiding of .action_secondary_btn in styles/globals.css to the navigation bar only, preventing unintended hiding of buttons in other views.

Strategy Token Corrections (Issue #3)
Verified the existence of MIA and NYC voting strategies.
Corrected the strategyTokenDecimals for NewYorkCityCoin (NYC) from 0 to 6 in common/constants.js

Hardware Wallet Support (Issue #6)
Added anchorMode: AnchorMode.Any to the cast-my-vote contract call in services/contract.js
This resolves transaction failures often experienced when using Leather with Ledger devices.

Verification:

Date Picker: Verified that changing the date updates the estimated block height.
Mobile: Verified that the voting interface is now accessible on smaller screens.
Contracts: Verified that transactions now include the correct anchor mode.

[vercel]

@svectoranu is attempting to deploy a commit to the blocksurvey1's projects Team on Vercel.

A member of the Team first needs to authorize it.

[314159265359879]

There is no test build publicly available, right?
I am happy to test the hardware wallet support fix, as well as the others, when it is available.

[winsznx]

alright, i will make that and update the repo