hscontrol: consolidate assets into single package

Move favicon.png, style.css, and headscale.svg to hscontrol/assets/
and create a single assets.go file with all embed directives.

Update hscontrol/handlers.go and hscontrol/templates/general.go to
use the centralized assets package.

hscontrol/assets/assets.go

@@ -0,0 +1,24 @@
+// Package assets provides embedded static assets for Headscale.
+// All static files (favicon, CSS, SVG) are embedded here for
+// centralized asset management.
+package assets
+
+import (
+	_ "embed"
+)
+
+// Favicon is the embedded favicon.png file served at /favicon.ico
+//
+//go:embed favicon.png
+var Favicon []byte
+
+// CSS is the embedded style.css stylesheet used in HTML templates.
+// Contains Material for MkDocs design system styles.
+//
+//go:embed style.css
+var CSS string
+
+// SVG is the embedded headscale.svg logo used in HTML templates.
+//
+//go:embed headscale.svg
+var SVG string

hscontrol/assets/style.css

@@ -9,10 +9,12 @@
   --md-primary-fg-color: #4051b5;
   --md-accent-fg-color: #526cfe;
   --md-typeset-a-color: var(--md-primary-fg-color);
-  --md-text-font: "Roboto", -apple-system, BlinkMacSystemFont, "Segoe UI",
-    "Helvetica Neue", Arial, sans-serif;
-  --md-code-font: "Roboto Mono", "SF Mono", Monaco, "Cascadia Code", Consolas,
-    "Courier New", monospace;
+  --md-text-font:
+    "Roboto", -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue",
+    Arial, sans-serif;
+  --md-code-font:
+    "Roboto Mono", "SF Mono", Monaco, "Cascadia Code", Consolas, "Courier New",
+    monospace;
 }
 
 /* Base Typography */

hscontrol/handlers.go

@@ -2,7 +2,6 @@ package hscontrol
 
 import (
 	"bytes"
-	_ "embed"
 	"encoding/json"
 	"errors"
 	"fmt"
@@ -14,6 +13,7 @@ import (
 
 	"github.com/chasefleming/elem-go/styles"
 	"github.com/gorilla/mux"
+	"github.com/juanfont/headscale/hscontrol/assets"
 	"github.com/juanfont/headscale/hscontrol/templates"
 	"github.com/juanfont/headscale/hscontrol/types"
 	"github.com/rs/zerolog/log"
@@ -278,12 +278,9 @@ func (a *AuthProviderWeb) RegisterHandler(
 	writer.Write([]byte(templates.RegisterWeb(registrationId).Render()))
 }
 
-//go:embed assets/favicon.png
-var favicon []byte
-
 func FaviconHandler(writer http.ResponseWriter, req *http.Request) {
 	writer.Header().Set("Content-Type", "image/png")
-	http.ServeContent(writer, req, "favicon.ico", time.Unix(0, 0), bytes.NewReader(favicon))
+	http.ServeContent(writer, req, "favicon.ico", time.Unix(0, 0), bytes.NewReader(assets.Favicon))
 }
 
 // BlankHandler returns a blank page with favicon linked.

hscontrol/templates/general.go

@@ -1,22 +1,15 @@
 package templates
 
 import (
-	_ "embed"
-
 	"github.com/chasefleming/elem-go"
 	"github.com/chasefleming/elem-go/attrs"
 	"github.com/chasefleming/elem-go/styles"
+	"github.com/juanfont/headscale/hscontrol/assets"
 )
 
-//go:embed style.css
-var headscaleCSS string
-
-//go:embed headscale.svg
-var headscaleSVG string
-
 // mdTypesetBody creates a body element with md-typeset styling
 // that matches the official Headscale documentation design.
-// Uses CSS classes with styles defined in headscaleCSS.
+// Uses CSS classes with styles defined in assets.CSS.
 func mdTypesetBody(children ...elem.Node) *elem.Element {
 	return elem.Body(attrs.Props{
 		attrs.Style: styles.Props{
@@ -41,7 +34,7 @@ func mdTypesetBody(children ...elem.Node) *elem.Element {
 
 // Styled Element Wrappers
 // These functions wrap elem-go elements using CSS classes.
-// Styling is handled by the CSS in headscaleCSS.
+// Styling is handled by the CSS in assets.CSS.
 
 // H1 creates a H1 element styled by .md-typeset h1
 func H1(children ...elem.Node) *elem.Element {
@@ -126,7 +119,7 @@ func contentContainer(children ...elem.Node) *elem.Element {
 // The logo is styled by the .headscale-logo CSS class.
 func headscaleLogo() elem.Node {
 	// Return the embedded SVG as-is
-	return elem.Raw(headscaleSVG)
+	return elem.Raw(assets.SVG)
 }
 
 // pageFooter creates a consistent footer for all pages.
@@ -198,7 +191,7 @@ func HtmlStructure(head, body *elem.Element) *elem.Element {
 				attrs.Href: "https://fonts.googleapis.com/css2?family=Roboto:wght@300;400;500;700&family=Roboto+Mono:wght@400;700&display=swap",
 			}),
 			// Material for MkDocs CSS styles
-			elem.Style(attrs.Props{attrs.Type: "text/css"}, elem.Raw(headscaleCSS)),
+			elem.Style(attrs.Props{attrs.Type: "text/css"}, elem.Raw(assets.CSS)),
 			head,
 		),
 		body,