feat: Add version tooltip to 'Powered by Kaze' footer

- Add VersionInfo struct to server
- Add SetVersion() method called from main.go
- Display version, commit, and build date in hoverable tooltip
- Tooltip uses same style as other tooltips in the UI

2 files changed, 45 insertions, 1 deletions

diff --git a/internal/server/server.go b/internal/server/server.go
index ab9ff24..6b7fbfb 100644
--- a/internal/server/server.go
+++ b/internal/server/server.go
@@ -31,6 +31,13 @@ var staticFS embed.FS
 // ReloadFunc is a callback function for reloading configuration
 type ReloadFunc func() error
 
+// VersionInfo contains build version information
+type VersionInfo struct {
+	Version string
+	Commit  string
+	Date    string
+}
+
 // Server handles HTTP requests for the status page
 type Server struct {
 	config       *config.Config
@@ -40,6 +47,7 @@ type Server struct {
 	server       *http.Server
 	templates    *template.Template
 	reloadConfig ReloadFunc
+	version      VersionInfo
 }
 
 // New creates a new HTTP server
@@ -225,6 +233,7 @@ type PageData struct {
 	Scale              float64       // UI scale factor (0.5-2.0)
 	RefreshMode        string        // page or api
 	RefreshInterval    int           // seconds
+	VersionTooltip     string        // JSON data for version tooltip
 }
 
 // StatusCounts holds monitor status counts for display
@@ -326,6 +335,7 @@ func (s *Server) handleIndex(w http.ResponseWriter, r *http.Request) {
 		Scale:              s.config.Display.Scale,
 		RefreshMode:        s.config.Display.RefreshMode,
 		RefreshInterval:    s.config.Display.RefreshInterval,
+		VersionTooltip:     s.formatVersionTooltip(),
 	}
 
 	overallUp := true
@@ -1023,6 +1033,15 @@ func (s *Server) SetReloadFunc(fn ReloadFunc) {
 	s.reloadConfig = fn
 }
 
+// SetVersion sets the version information for display
+func (s *Server) SetVersion(version, commit, date string) {
+	s.version = VersionInfo{
+		Version: version,
+		Commit:  commit,
+		Date:    date,
+	}
+}
+
 // handleAPIReload triggers a configuration reload (always requires authentication)
 func (s *Server) handleAPIReload(w http.ResponseWriter, r *http.Request) {
 	if s.reloadConfig == nil {
@@ -1474,6 +1493,31 @@ func formatUptimeTooltip(uptimePercent float64, totalChecks int64, lastFailure *
 	return string(b)
 }
 
+// formatVersionTooltip creates JSON data for version tooltip
+func (s *Server) formatVersionTooltip() string {
+	rows := []map[string]string{
+		{"label": "Version", "value": s.version.Version, "class": ""},
+		{"label": "Commit", "value": s.version.Commit, "class": ""},
+	}
+
+	// Parse and format build date if available
+	if s.version.Date != "" && s.version.Date != "unknown" {
+		if t, err := time.Parse(time.RFC3339, s.version.Date); err == nil {
+			rows = append(rows, map[string]string{"label": "Built", "value": t.Format("Jan 2, 2006 15:04"), "class": ""})
+		} else {
+			rows = append(rows, map[string]string{"label": "Built", "value": s.version.Date, "class": ""})
+		}
+	}
+
+	data := map[string]interface{}{
+		"header": "Kaze",
+		"rows":   rows,
+	}
+
+	b, _ := json.Marshal(data)
+	return string(b)
+}
+
 // simplifyErrorMessage simplifies error messages for display
 func simplifyErrorMessage(err string) string {
 	if err == "" {
diff --git a/internal/server/templates/index.html b/internal/server/templates/index.html
index 6471e53..35f08c1 100644
--- a/internal/server/templates/index.html
+++ b/internal/server/templates/index.html
@@ -187,7 +187,7 @@
         <footer class="mt-12 pt-6 border-t border-neutral-200 dark:border-neutral-800">
             <div class="flex items-center justify-between text-xs text-neutral-500 dark:text-neutral-400">
                 <span data-tooltip='{{.LastUpdatedTooltip}}'{{if $.UseBrowserTimezone}} data-timestamp="{{$.LastUpdated.Format "2006-01-02T15:04:05Z07:00"}}" data-format="timeago"{{end}}>Updated {{timeAgo $.LastUpdated}}</span>
-                <span>Powered by <a href="https://github.com/Fuwn/kaze" class="hover:text-neutral-900 dark:hover:text-neutral-100">Kaze</a></span>
+                <span data-tooltip='{{.VersionTooltip}}'>Powered by <a href="https://github.com/Fuwn/kaze" class="hover:text-neutral-900 dark:hover:text-neutral-100">Kaze</a></span>
             </div>
         </footer>
     </div>