fix: serve datastar locally and clean up session/route config

Replace CDN-hosted datastar beta.11 with local v1.0.0-RC.7 to fix
client-side expression incompatibilities with the Go SDK. Also fix
quoted CSS class keys in data-class expressions, harden session cookie
settings (named cookie, Secure flag), simplify SetupRoutes to not
return an error, and regenerate templ output.

main.go

@@ -90,9 +90,7 @@ func run(ctx context.Context) error {
 		sessionManager.LoadAndSave,
 	)
 
-	if err := router.SetupRoutes(r, queries, sessionManager, nc, store, snakeStore, assets); err != nil {
-		return fmt.Errorf("setting up routes: %w", err)
-	}
+	router.SetupRoutes(r, queries, sessionManager, nc, store, snakeStore, assets)
 
 	// HTTP server
 	srv := &http.Server{