fix(dashpay): add back navigation to notifications

[llbartekll]

Issue being fixed or feature implemented

The Notifications screen is pushed from Home inside a SwiftUI hosting controller whose UIKit navigation bar is hidden, leaving no visible way to return to Home.

What was done?

• added the standard in-content back button and centered Notifications title
• wired Back to pop the existing Home navigation stack through a weak callback
• prevented rapid taps from stacking duplicate Notifications screens
• left Home profile navigation and shared navigation-bar behavior unchanged

How Has This Been Tested?

• dashpay Debug build for an arm64 iOS Simulator succeeded
• git diff --check passed
• verified the final commit changes only NotificationsScreen and its Home entry point

Breaking Changes

None.

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated relevant unit/integration/functional/e2e tests
• I have made corresponding changes to the documentation

The dashpay scheme has no configured test target; this UI-only change was verified with a full build and navigation-flow audit.

Summary by CodeRabbit

• UI Improvements
  • Added a custom Notifications screen header with a centered title and back button.
  • Improved back navigation from the Notifications screen.
  • Prevented notification navigation when the Home screen is not currently active.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: b0cc1dd8-1d92-48cf-a6b1-5335bfc0971d

📥 Commits

Reviewing files that changed from the base of the PR and between 916ac4a and eb9b9d8.

📒 Files selected for processing (2)

• DashWallet/Sources/UI/DashPay/Contacts/SwiftUI/NotificationsScreen.swift
• DashWallet/Sources/UI/Home/HomeViewController.swift

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📝 Walkthrough

Walkthrough

NotificationsScreen now uses a custom navigation bar and back callback. HomeViewController validates its navigation context before pushing the hosted notifications screen.

Changes

Notifications navigation

Layer / File(s)	Summary
Custom notifications header DashWallet/Sources/UI/DashPay/Contacts/SwiftUI/NotificationsScreen.swift	NotificationsScreen now requires an onBack callback and renders a custom back button with a centered localized “Notifications” title.
Validated notifications presentation DashWallet/Sources/UI/Home/HomeViewController.swift	The notification action now requires HomeViewController to be the navigation stack top, supplies a pop callback, and pushes the hosted screen through the validated navigation controller.

Estimated code review effort: 2 (Simple) | ~10 minutes

Suggested reviewers: romchornyi, quantumexplorer

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: adding back navigation to the DashPay notifications screen.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/fix-notifications-back-button

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