Feature/enhanced UI and notifications

[s0nik42]

Summary

This PR introduces significant UI/UX improvements to the Zabbix Monitor app, including clickable navigation to the Zabbix web interface, macOS notifications for new problems, and an enhanced menu bar display.

What's New

🔗 Clickable Navigation

• Click on any host to open its problems page in Zabbix web UI
• Click on any problem to open its details in Zabbix web UI
• Proper URL formatting with filter parameters to show exactly what you need

🔔 Smart Notifications

• Get notified when new problems occur (not when they're resolved)
• Problems are grouped by host with a 10-second buffer to avoid notification spam
• Auto-dismissing notifications for a clean experience
• Tracks problem state between refreshes to detect only new issues

📊 Improved Menu Bar Display

• Shows individual severity counts with color-coded emoji badges (⚫ Disaster, 🔴 High, 🟠 Average, 🟡 Warning, 🔵 Info, ⚪ Not Classified)
• Displays ✅ with total host count when no problems exist
• Shows ⚠ error occurs
• All severity levels visible at once for complete status at a glance

👁-Over Previews

• Hover over host problem badges to see a detailed list of all issues for that host
• Popover shows problem names, severity, and timestamps
• Click on problems in the popover to open them in Zabbix
• Adaptive scrolling (only appears when content exceeds 70% of screen height)

🎯 Better Defaults

• "Hosts" tab now opens by default instead of "Problems"
• Each host shows individual severity badges instead of a single combined badge
• Improved visual hierarchy and clarity

Technical Changes

Files Modified

• ZabbixMenuBar/ZabbixAPIClient.swift - Added notification system, severity counting, and problem tracking
• ZabbixMenuBar/ZabbixMenuBarApp.swift - New menu bar status view with emoji-based display, notification authorization
• ZabbixMenuBar/ZabbixStatusView.swift - Clickable links, mouse-over popovers, per-host severity badges, tab order changes
• Shared/Localizable.xcstrings - New localized strings for notifications and UI elements
• README.md - Updated documentation to reflect new features

Key Implementation Details

• Uses UserNotifications framework for native macOS notifications
• Tracks previous problem state in UserDefaults to detect new issues
• 10-second notification buffer using DispatchWorkItem to group problems by host
• Menu bar updates via @Published properties with .onChange() handlers
• Zabbix URLs constructed with proper filter parameters (filter_set, hostids[], etc.)
• Adaptive UI with mouse-over delays to prevent accidental popover dismissal

Testing

Tested on macOS Sequoia with:

• Multiple severity levels active simultaneously
• New problem detection and notification delivery
• Clickable links to Zabbix web UI (hosts and problems)
• Mouse-over popover functionality with adaptive scrolling
• Menu bar display updates across all states (problems, no problems, error)

Screenshots

Menu bar now shows all active severity counts:

• ⚫6 🔴4 🟠13 🟡9 🔵22 (when problems exist)
• ✅ 103 (when no problems, shows total hosts)