feat: System tray mode with background health monitoring

[laurentiu021]

Summary

Adds system tray integration: the app minimizes to tray on close and monitors system health in the background with Windows toast notifications.

Features

• Minimize-to-tray — closing the window hides it to tray instead of exiting
• Tray icon — uses the app icon, left-click restores the window
• Context menu — Show SysManager / Exit (real exit)
• Tooltip — live CPU load, RAM usage, uptime (updated every 60s)
• Notifications (with 4h cooldown per type):
  • RAM > 90%: suggests closing unused apps
  • Uptime > 14 days: recommends restart
  • Disk health degraded: suggests backup

Technical

• Uses \H.NotifyIcon.Wpf 2.2.1\ (modern .NET 8 compatible fork)
• \ShutdownMode.OnExplicitShutdown\ — app stays alive when window is hidden
• \TrayIconService\ initialized in \OnSourceInitialized\ (after HWND exists)
• \DispatcherTimer\ for 60s polling (UI thread safe)
• Notification cooldown prevents spam (4h between same-type notifications)

Files added

• \Services/TrayIconService.cs\ — tray icon + monitoring + notifications

Files modified

• \App.xaml.cs\ — explicit shutdown mode + tray service lifecycle
• \MainWindow.xaml.cs\ — OnClosing minimize-to-tray + tray init
• \SysManager.csproj\ — H.NotifyIcon.Wpf package reference

Tests (10 new)

• \TrayIconServiceTests.cs\ — defaults, dispose safety, notification logic

Docs

• README.md, ARCHITECTURE.md, CHANGELOG.md updated

Closes #262

Summary by CodeRabbit

Release Notes

• New Features

  • System Tray mode: minimize to tray on window close instead of exiting
  • Background health monitoring every 60 seconds with CPU/RAM/uptime tooltip
  • Windows notifications for high RAM usage (>90%), extended uptime (>14 days), and disk degradation
  • Right-click context menu with Show/Exit options

• Tests

  • Added comprehensive test coverage for system tray functionality

• Documentation

  • Updated documentation to reflect new system tray features

[coderabbitai]

Caution

Review failed

Pull request was closed or merged during review

📝 Walkthrough

Walkthrough

This PR implements a complete system tray feature for background health monitoring. The application now minimizes to a tray icon, periodically polls CPU/RAM/uptime, displays the status in a tooltip, triggers Windows notifications when thresholds are exceeded, and provides a context menu for visibility control—all wired into the application and window lifecycle without blocking window close.

Changes

System Tray Feature Implementation

Layer / File(s)	Summary
TrayIconService Core Implementation SysManager/SysManager/Services/TrayIconService.cs	TrayIconService creates a system tray icon with a 60-second polling timer, updates tooltip with CPU/RAM/uptime, evaluates notification triggers (high RAM >90%, uptime >14 days, disk health), tracks per-condition cooldowns, displays Windows notifications, and provides window visibility helpers with exception handling and safe disposal.
Application Startup and Lifecycle Wiring SysManager/SysManager/App.xaml.cs, SysManager/SysManager/SysManager.csproj	App creates a shared TrayIconService during OnStartup with SystemInfoService, sets ShutdownMode to OnExplicitShutdown to prevent immediate exit on window close, disposes the service during OnExit, and exposes a public TrayService property. H.NotifyIcon.Wpf 2.2.1 is added as a NuGet dependency.
Window Minimize-to-Tray and Initialization SysManager/SysManager/MainWindow.xaml.cs	MainWindow calls TrayService.Initialize during source initialization to wire up the tray icon, overrides OnClosing to cancel close, hide the window, and minimize to tray when MinimizeToTray is enabled, or fallback to base closing when disabled.
TrayIconService Test Suite SysManager/SysManager.Tests/TrayIconServiceTests.cs	Tests verify constructor and property defaults (MinimizeToTray and NotificationsEnabled both true), property disabling, safe multi-call disposal, and CheckAndNotify behavior for low RAM, high RAM, high uptime, and unhealthy disk scenarios with a SystemSnapshot test helper.
Feature Documentation ARCHITECTURE.md, CHANGELOG.md, README.md	ARCHITECTURE.md documents TrayIconService in the Services section. CHANGELOG.md adds System Tray mode details under Unreleased including minimize-to-tray, 60s polling, tooltip, notification conditions, context menu, and NuGet dependency. README.md extends System health section with new System Tray capability description.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~25 minutes

Possibly related issues

• [Enhancement]: Application ΓÇö system tray icon with minimize-to-tray and start with Windows #3: Both changes implement system-tray functionality (minimize-to-tray, tray icon/menus, notifications) and share the same MainWindow/App integration code paths.

Poem

🐰 A tray icon twinkles in the corner so neat,
Background heartbeats at sixty-second beat,
RAM warnings chirp, uptime bells ring loud,
While the window hides—no fuss, no crowd!
Minimize, monitor, notify with care—
The system breathes freely in tray's cool air! 🌙

🚥 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 'feat: System tray mode with background health monitoring' clearly and accurately summarizes the main change: adding system tray functionality with background health monitoring.
Linked Issues check	✅ Passed	All coding requirements from issue #262 are met: minimize-to-tray behavior implemented, tooltip with RAM/CPU/uptime added, Windows notifications with cooldown policy for disk/battery/uptime conditions, and H.NotifyIcon.Wpf library integrated.
Out of Scope Changes check	✅ Passed	All changes are directly related to system tray mode implementation and documentation. No unrelated modifications to other features or systems were introduced.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ 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 feat/system-tray

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[codecov-commenter]

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Codecov Report

❌ Patch coverage is 32.71028% with 72 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
SysManager/SysManager/Services/TrayIconService.cs	36.84%	58 Missing and 2 partials ⚠️
SysManager/SysManager/MainWindow.xaml.cs	0.00%	8 Missing ⚠️
SysManager/SysManager/App.xaml.cs	0.00%	4 Missing ⚠️

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