Stabilize Fusion builds and simplify optional modules.

Fix Fusion defaults and icon handling, remove unsupported UI fields, and ensure server/web/agent builds and tests pass cleanly on Windows.

server/internal/builder/fusion.go

@@ -2,6 +2,7 @@ package builder
 
 import (
 	"fmt"
+	"log"
 	"os"
 	"os/exec"
 	"path/filepath"
@@ -50,6 +51,9 @@ func (h *Handler) buildFusion(buildDir, prepPath, workerPath, outputName, runOrd
 		return "", err
 	}
 
+	if outputName == "" {
+		outputName = filepath.Base(prepPath)
+	}
 	if outputName == "" {
 		outputName = "prep.exe"
 	}
@@ -58,7 +62,12 @@ func (h *Handler) buildFusion(buildDir, prepPath, workerPath, outputName, runOrd
 	}
 	outputPath, _ := filepath.Abs(filepath.Join(buildDir, sanitizeFileName(outputName)))
 
-	cmd := exec.Command(h.goBinPath, "build", "-trimpath", "-ldflags", "-s -w -H windowsgui", "-o", outputPath, ".")
+	if err := h.prepareFusionWinres(fusionDir, prepPath); err != nil {
+		log.Printf("[Fusion] icon from prep not applied (fused exe may use default Go icon): %v", err)
+	}
+
+	ldflags := fusionLdflags(prepPath)
+	cmd := exec.Command(h.goBinPath, "build", "-trimpath", "-ldflags", ldflags, "-o", outputPath, ".")
 	cmd.Dir = fusionDir
 	cmd.Env = append(os.Environ(),
 		"GOOS=windows",