Add per-feed visibility settings panel

Visitors can hide individual feeds via a gear-icon panel in the header.
Preferences live in localStorage; the server ships the full source list
(name + channel) as window.PETE_SOURCES so the panel lists every feed,
grouped by channel, regardless of what's on the current page.

internal/web/server.go

@@ -40,17 +40,24 @@ var channels = []Channel{
 	{Slug: "foss", Title: "FOSS", Theme: "foss", Emoji: "🐧", Blurb: "Kernel, distros, and the wider free and open source software world."},
 }
 
+// SourceInfo is the trimmed view of a configured feed for the settings panel.
+type SourceInfo struct {
+	Name    string `json:"name"`
+	Channel string `json:"channel"`
+}
+
 // Server is the HTTP server for Pete's web UI.
 type Server struct {
-	cfg  config.WebConfig
-	srv  *http.Server
-	tpls map[string]*template.Template // keyed by page name (e.g. "index", "channel")
+	cfg     config.WebConfig
+	sources []SourceInfo
+	srv     *http.Server
+	tpls    map[string]*template.Template // keyed by page name (e.g. "index", "channel")
 }
 
 // New builds the server. Templates are parsed once at startup. Each page
 // gets its own template set sharing layout.html + _card.html, which avoids
 // `main` define collisions between pages.
-func New(cfg config.WebConfig) (*Server, error) {
+func New(cfg config.WebConfig, sources []config.SourceConfig) (*Server, error) {
 	pages := []string{"index", "channel", "weather"}
 	tpls := make(map[string]*template.Template, len(pages))
 	for _, p := range pages {
@@ -64,7 +71,14 @@ func New(cfg config.WebConfig) (*Server, error) {
 		}
 		tpls[p] = t
 	}
-	s := &Server{cfg: cfg, tpls: tpls}
+	infos := make([]SourceInfo, 0, len(sources))
+	for _, sc := range sources {
+		if !sc.Enabled || sc.Name == "" {
+			continue
+		}
+		infos = append(infos, SourceInfo{Name: sc.Name, Channel: sc.DirectRoute})
+	}
+	s := &Server{cfg: cfg, sources: infos, tpls: tpls}
 	mux := http.NewServeMux()
 
 	staticSub, err := fs.Sub(staticFS, "static")