refactor: use SDK-native types for CLI parsing, centralize client initialization & output helpers

[suhailkakar]

Note

Medium Risk
Primarily a refactor, but it changes CLI argument parsing types and authentication/client initialization paths, which could cause subtle runtime/CLI compatibility issues (e.g., parsing/validation differences and RPC connectivity).

Overview
Switches many CLI commands from manual string parsing to SDK-native clap-parsed types (e.g. Address, B256, U256) for addresses/condition IDs/token IDs, removing parse_address/parse_condition_id helpers and consolidating enum conversions via the new enum_from! macro.

Centralizes common behavior: main.rs now lazily initializes shared SDK clients, errors are printed via output::print_error (used by both main and shell), and table output formatting is normalized with shared helpers (NONE, format_date, active_status).

Makes a few operational tweaks: Polygon RPC URL can now be overridden via POLYMARKET_RPC_URL, USDC address is shared as USDC_ADDRESS_STR, and wallet setup/import now stores a canonical hex key derived from the signer (signer_key_hex) rather than normalizing user input.

^{Written by Cursor Bugbot for commit 7431398. This will update automatically on new commits. Configure here.}

[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

^{Bugbot Autofix is OFF. To automatically fix reported issues with Cloud Agents, enable Autofix in the Cursor dashboard.}