v0.4.0

• Add NTP as a distinct service protocol with standard request packet creation, default port 123, request correlation,
  and response validation
• Add a catalogue of public NTP servers and an option to import them from the Add Ping Services dialog
• Add DNS as a distinct service protocol with default port 53, request correlation, response validation, text-list
  parsing, and public resolver imports
• Add SMTP probes with default port 25 and complete 220 greeting validation
• Add WebSocket probes for ws:// and wss:// endpoints, including custom ports and paths
• Add MQTT 3.1.1 probes with default port 1883, randomized client identifiers, and CONNACK validation
• Add TLS probes with default port 443, SNI, negotiated-version reporting, and system certificate validation
• Add SSH probes with default port 22 and SSH 2.0 identification validation
• Add STUN Binding probes with default port 3478, transaction correlation, and mapped-address validation
• Add SIP OPTIONS probes over UDP with default port 5060, transaction correlation, provisional-response handling, and
  final status validation
• Add IMAP probes with default port 143, greeting validation, and a tagged CAPABILITY exchange
• Add a shared public-host catalogue with multiple credential-free TLS, NTP, HTTP, WebSocket, SSH, SMTP, IMAP, MQTT,
  STUN, and SIP endpoints
• Add public HTTP targets for Google, Microsoft, Apple, Mozilla, Canonical, Cloudflare, and GitHub
• Expand the public-host catalogue with Let's Encrypt, Azure DevOps, Codeberg, Fastmail, Eclipse IoT, and Twilio
  endpoints
• Add individual public-host import actions for TLS, DNS, NTP, HTTP, WebSocket, SSH, SMTP, IMAP, MQTT, STUN, and SIP
• Add implicit TLS, certificate validation, and hostname validation to IMAP probes on port 993
• Fix public-service imports removing or retaining the wrong empty rows
• Fix Windows ICMP probes timing out before the configured deadline by accounting for the platform's 500 ms timeout
  resolution
• Fix TCP, UDP, and NTP hostname/port parsing, endpoint creation, address-family selection, and NTP default-port
  handling
• Fix UDP probes reporting success from a connectionless sending alone by waiting for a response from the remote service
• Fix HTTP replies using 0.0.0.0 after restoring reply history by resolving DNS independently of historical success
  counts and refreshing unresolved endpoints before HTTP requests
• Fix response-time charts handling timeouts and missing statistics, displaying reply history out of order, mixing
  average calculations, failing with an unlimited graph cache, and retaining stale data after statistics are reset
• Add configurable response-time graph sample windows, freeze/resume, automatic and full scaling, rolling averages,
  percentile, jitter, and displayed-window loss statistics
• Add multiservice response-time comparisons with minimum, average, current, maximum, failure status, host labels, and
  consolidated per-host tooltips
• Improve response-time chart timeout markers, multi-service current-value markers, outlined labels, and label spacing,
  value and axis formatting, tooltip deduplication, and transitions between single-service and multi-service views
• Add response-time graph controls to the main and pop-out views for sample window, freeze, scale, and synchronized
  service-enablement toggles, with collapsible pop-out controls for probe interval and timeout and multi-service batch
  editing
• Add live reply-status summaries and replace disabled summary buttons with reusable, theme-aware status badges across
  the ping and network-interface views
• Optimize HTTP probes to complete after response headers and use the declared content length without downloading or
  buffering the response body
• Prevent slow services from delaying scheduled probes for other services while still blocking overlapping probes for
  the same service
• Enforce the configured reply-cache limit both while adding replies and after restoring resilient reply history
• Fix service-list parsing so protocol prefixes, HTTP/HTTPS URLs, descriptions, groups, intervals, timeouts, buffer
  sizes, and NTP entries are handled independently
• Cap configurable probe timeouts at 65,535 seconds and reuse unchanged ICMP PingOptions
• Reduce probe allocations with pooled UDP/NTP buffers and allocation-free elapsed-time measurements
• Keep pooled NTP request storage alive until asynchronous sends and response validation are complete
• Replace the custom FastObservableCollection and MintPlayer dependencies with synchronized ObservableCollections
  views
• Refactor shared provider metadata into a common model and consolidate the public NTP catalogue into BaseProvider
• Add DotNext buffer packages for allocation-aware networking and data-processing improvements
• Fix the Network Interfaces page and adapter details not populating on the first refresh, including when automatic
  refresh is disabled
• Dispose removed network-interface bridges and avoid constructing duplicate interface card controls
• Run automatic speed tests on the UI dispatcher and prevent cancellation from exposing a premature ready state
• Handle disabled automatic-test intervals, correct Speedtest bandwidth conversions, and separate phase progress from
  latency details
• Upgrade AvaloniaUI from 12.1.0 to 12.1.1