Revert non-color SPV mode check removal from PR #572

[Copilot]

PR #572 accidentally removed an SPV mode guard that prevents RPC chain lock polling in SPV mode.

Changes

• Restored SPV mode check in ConnectionStatus::refresh() (lines 243-246 of src/context/connection_status.rs)

Context

The removed code:

// SPV mode does not use RPC chain lock polling.
if self.backend_mode() == CoreBackendMode::Spv {
    return AppAction::None;
}

This guard prevents unnecessary RPC calls when running in SPV mode, where chain lock polling is not supported. Without it, SPV mode would attempt RPC chain lock polling on every refresh cycle.

After this fix, PR #572 contains only color refactoring across 64 files (centralizing ~120 hardcoded Color32 values into DashColors constants).

Warning

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Original prompt

Pull request: https://github.com/dashpay/dash-evo-tool/pull/572/files should only contain color changes. Verify this.

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