Add versioned Docker builder tags and Settings about block

Tag Docker builder images with the current application version in both Linux Docker build scripts so different release environments do not overwrite each other with one floating builder tag.

Replace the Settings Scheduler note with an About block that shows the GoSentry version, Go runtime version, Fyne module version, and the project repository link.

src/gui/app.go

@@ -2,6 +2,9 @@ package gui
 
 import (
 	"fmt"
+	"net/url"
+	"runtime"
+	"runtime/debug"
 	"sort"
 	"strconv"
 	"strings"
@@ -24,6 +27,7 @@ const appID = "io.github.pysentry.desktop"
 const allFolders = "All"
 const noFolder = "No folder"
 const minJobsSidebarWidth float32 = 480
+const projectRepositoryURL = "https://gitea.mixdep.ru/mix/gosentry"
 
 // The GUI package aliases core types to keep widget callbacks short. The actual
 // durable model still lives in src/core, so GUI code does not define a second
@@ -836,11 +840,41 @@ func settingsView(w fyne.Window, store *core.Store, jobs *[]job) fyne.CanvasObje
 		saveSettings,
 		settingsStatus,
 		widget.NewSeparator(),
-		widget.NewLabelWithStyle("Scheduler", fyne.TextAlignLeading, fyne.TextStyle{Bold: true}),
-		widget.NewLabel("Current core supports @every schedules and standard 5-field cron expressions."),
+		widget.NewLabelWithStyle("About", fyne.TextAlignLeading, fyne.TextStyle{Bold: true}),
+		detailRow("GoSentry", widget.NewLabel(core.Version)),
+		detailRow("Go", widget.NewLabel(runtime.Version())),
+		detailRow("Fyne", widget.NewLabel(fyneVersion())),
+		detailRow("Repository", widget.NewHyperlink(projectRepositoryURL, mustParseURL(projectRepositoryURL))),
 	))
 }
 
+func fyneVersion() string {
+	info, ok := debug.ReadBuildInfo()
+	if !ok {
+		return "unknown"
+	}
+	for _, dependency := range info.Deps {
+		if dependency.Path == "fyne.io/fyne/v2" {
+			if dependency.Replace != nil && dependency.Replace.Version != "" {
+				return dependency.Replace.Version
+			}
+			if dependency.Version != "" {
+				return dependency.Version
+			}
+			return "local"
+		}
+	}
+	return "unknown"
+}
+
+func mustParseURL(raw string) *url.URL {
+	parsed, err := url.Parse(raw)
+	if err != nil {
+		return &url.URL{}
+	}
+	return parsed
+}
+
 func chooseFolder(w fyne.Window, target *widget.Entry) {
 	folderDialog := dialog.NewFolderOpen(func(uri fyne.ListableURI, err error) {
 		if err != nil || uri == nil {