fix(ui): restore Governance → Voting (build break + missing back navigation)

[QuantumExplorer]

Two fixes to the same entry point, one commit each.

1. develop is currently red

develop does not compile. #923 and #924 collided after both merged green independently:

• feat(dashpay): make username voting real #923 replaced UsernameVotingViewController with the SwiftUI UsernameVotingScreen, updating the showVoting() that lived in MainMenuViewController at the time that PR was written.
• feat(ui): group Masternodes and Voting under a Governance menu #924 had since moved the Voting entry point into GovernanceMenuScreen, which feat(dashpay): make username voting real #923 never saw.

On the merged tip the two halves are crossed:

• GovernanceMenuScreen.swift:123 — the live entry point — still called the deleted UsernameVotingViewController: error: cannot find 'UsernameVotingViewController' in scope.
• MainMenuViewController.showVoting() — the updated copy — was orphaned: defined, never called, because feat(ui): group Masternodes and Voting under a Governance menu #924 removed its caller.

So the reachable path was broken and the fixed path was unreachable. Points Governance at UsernameVotingScreen (exactly what #923 wrote, in the location that is actually reachable) and deletes the dead copy.

2. No way back out of a contested name

With the build restored, opening a name stranded the user: the contest detail had no back button and no navigation bar at all.

showVoting() pushed a bare UIHostingController(rootView: UsernameVotingScreen()). Both voting screens set .navigationTitle, and the list drills into ContestDetailScreen via NavigationLink — but with no NavigationStack there was no bar to host that title, and no automatic back button for the push.

Wrapped in a NavigationStack with a leading chevron that pops the UIKit stack — the same wrapper showMasternodes() in this file already uses, for the same reason. Contest detail now gets its standard back button, and the root gets a way back to Governance.

Verification

dashpay scheme builds clean (arm64 simulator) — it does not on develop without commit 1. Installed and launched on the simulator; back navigation itself is unverified on-device (PIN-gated), so the thing to click is Governance → Voting → a contested name → back.

[coderabbitai]

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 2de56b85-e24a-4214-9eb9-525507411ece

📥 Commits

Reviewing files that changed from the base of the PR and between 86301f0 and cfb8667.

📒 Files selected for processing (2)

• DashWallet/Sources/UI/Menu/Governance/GovernanceMenuScreen.swift
• DashWallet/Sources/UI/Menu/Main/MainMenuViewController.swift

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