fix: varios wallet fixes, add pending transactions to explorer and delete unnecessary files

[pablocampogo]

Summary

This PR delivers fixes and improvements across the wallet and explorer web applications, along with repository cleanup.

Explorer: Pending Transaction Support

• Tabbed transactions view — The transactions page now separates confirmed and pending transactions into dedicated tabs, each with independent pagination. A badge on the pending tab shows the current mempool count.
• Pending status indicators — Transaction detail pages and table rows correctly identify pending transactions (by block height or status) and display them with a yellow badge instead of the default green success badge. The confirmed timestamp is replaced with an "Awaiting block inclusion" label for pending items.

Wallet: Governance & Transaction Fixes

• Governance flow restructured — The proposal submission workflow was previously presented as a single three-step card. It is now split into three independent action cards (Submit a Proposal, Vote on Proposal, Submit to Network) so each step is discoverable and can be used individually.
• Governance transaction field corrections — Fixed field name mappings and auto-populate behavior in governance-related transactions so that parameter values, block heights, and signer addresses resolve correctly when submitting proposals and polls.
• Staking prefill — The stake action now prefills the operator address from the active account, reducing manual entry.

Repository Cleanup

• Removed committed build artifacts, scratch scripts, editor config files, and generated caches that should not be tracked.
• Updated .gitignore to cover the compiled main binary, Emacs .projectile files, and Hardhat's Solidity cache.