feat(config): dynamic profile panel, generic save, tabs margin fix

- Config tabs now have bottom padding for visual spacing
- Profile panel dynamically renders all config fields (strings, bools,
  arrays, nested objects) — new struct fields appear automatically
- handleSaveProfile uses generic JSON merge via deepMerge, so any
  new Profile field works without handler changes
- RenderFields recursively renders config sections with edit/view modes

💘 Generated with Crush

Assisted-by: GLM-5.1 via Crush <crush@charm.land>

internal/api/handlers_config.go

@@ -53,32 +53,27 @@ func (s *Server) handleSaveProfile(w http.ResponseWriter, r *http.Request) {
 		writeError(w, "no config", http.StatusNotFound)
 		return
 	}
-	var body struct {
-		Name   string `json:"name"`
-		Pseudo string `json:"pseudo"`
-		Email  string `json:"email"`
-		Editor string `json:"editor"`
-		Shell  string `json:"shell"`
+
+	currentJSON, err := json.Marshal(s.config.Profile)
+	if err != nil {
+		writeError(w, err.Error(), http.StatusInternalServerError)
+		return
 	}
-	if err := json.NewDecoder(r.Body).Decode(&body); err != nil {
+	var currentMap map[string]interface{}
+	json.Unmarshal(currentJSON, &currentMap)
+
+	var updates map[string]interface{}
+	body, _ := io.ReadAll(r.Body)
+	if err := json.Unmarshal(body, &updates); err != nil {
 		writeError(w, err.Error(), http.StatusBadRequest)
 		return
 	}
-	if body.Name != "" {
-		s.config.Profile.Name = body.Name
-	}
-	if body.Pseudo != "" {
-		s.config.Profile.Pseudo = body.Pseudo
-	}
-	if body.Email != "" {
-		s.config.Profile.Email = body.Email
-	}
-	if body.Editor != "" {
-		s.config.Profile.Preferences.Editor = body.Editor
-	}
-	if body.Shell != "" {
-		s.config.Profile.Preferences.Shell = body.Shell
-	}
+
+	deepMerge(currentMap, updates)
+
+	mergedJSON, _ := json.Marshal(currentMap)
+	json.Unmarshal(mergedJSON, &s.config.Profile)
+
 	if err := config.Save(s.config); err != nil {
 		writeError(w, err.Error(), http.StatusInternalServerError)
 		return
@@ -86,6 +81,20 @@ func (s *Server) handleSaveProfile(w http.ResponseWriter, r *http.Request) {
 	writeJSON(w, map[string]string{"status": "ok"})
 }
 
+func deepMerge(dst, src map[string]interface{}) {
+	for k, sv := range src {
+		if dv, ok := dst[k]; ok {
+			dstMap, dOk := dv.(map[string]interface{})
+			srcMap, sOk := sv.(map[string]interface{})
+			if dOk && sOk {
+				deepMerge(dstMap, srcMap)
+				continue
+			}
+		}
+		dst[k] = sv
+	}
+}
+
 func (s *Server) handleSaveProvider(w http.ResponseWriter, r *http.Request) {
 	if r.Method != "PUT" {
 		writeError(w, "PUT only", http.StatusMethodNotAllowed)