Wire BaseViewModel protocol into BaseViewController and migrate Account VM/VC to delegate-based error handling

[ibrahimethem]

Motivation

• Standardize MVVM wiring and centralize error presentation by requiring a view model protocol and delegating error reporting through a base delegate interface.
• Replace ad-hoc closures for error handling with a protocol/delegate approach so view controllers can receive errors via BaseViewModelDelegate.

Description

• Add BaseViewModelDelegate and BaseViewModelProtocol and make BaseViewModel conform to BaseViewModelProtocol with a weak var delegate accessor in Topical Dictionary/ViewModel/BaseViewModel.swift.
• Update BaseViewController to expose var baseViewModel: BaseViewModelProtocol? that assigns baseViewModel?.delegate = self and implement didReceiveError(_:) which calls presentError(_:) in Topical Dictionary/Controller/BaseViewController.swift.
• Migrate AccountViewModel to inherit BaseViewModel, call delegate?.didReceiveError(err) on errors, and keep a separate accountDelegate for view-specific callbacks in Topical Dictionary/ViewModel/AccountViewModel.swift.
• Update AccountViewController to inherit BaseViewController, move view model creation into configureViewModel() and set baseViewModel = viewModel, removing the prior closure-based error binding in Topical Dictionary/Controller/AccountViewController.swift.

Testing

• No automated tests were executed for these changes.

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Codex Task