feat: add subscription plan inference and Management Center theme sync

plugin/theme.go

@@ -0,0 +1,79 @@
+package plugin
+
+import (
+	"encoding/json"
+	"strings"
+)
+
+// ThemeStorageState represents the zustand-persisted theme state from CLIProxyAPI Management Center.
+type ThemeStorageState struct {
+	State struct {
+		Theme         string `json:"theme"`
+		ResolvedTheme string `json:"resolvedTheme"`
+	} `json:"state"`
+	Version int `json:"version"`
+}
+
+// ResolveThemeFromStorage extracts theme configuration from the 'cli-proxy-theme' localStorage JSON.
+// Returns the user-selected theme setting ("auto", "white", "light", "dark") and the resolved theme ("dark" or "light"/"white").
+func ResolveThemeFromStorage(storageJSON string) (theme string, resolved string) {
+	theme = "auto"
+	resolved = "light"
+
+	s := strings.TrimSpace(storageJSON)
+	if s == "" {
+		return theme, resolved
+	}
+
+	// 1. Try zustand persist format
+	var zustandState ThemeStorageState
+	if err := json.Unmarshal([]byte(s), &zustandState); err == nil && (zustandState.State.Theme != "" || zustandState.State.ResolvedTheme != "") {
+		if zustandState.State.Theme != "" {
+			theme = zustandState.State.Theme
+		}
+		if zustandState.State.ResolvedTheme != "" {
+			resolved = zustandState.State.ResolvedTheme
+		} else {
+			switch theme {
+			case "dark":
+				resolved = "dark"
+			case "white", "light":
+				resolved = "light"
+			default:
+				resolved = "light"
+			}
+		}
+		return theme, resolved
+	}
+
+	// 2. Try simple map {"theme": "..."}
+	var simpleMap map[string]any
+	if err := json.Unmarshal([]byte(s), &simpleMap); err == nil {
+		if t, ok := simpleMap["theme"].(string); ok && t != "" {
+			theme = t
+			if r, ok2 := simpleMap["resolvedTheme"].(string); ok2 && r != "" {
+				resolved = r
+			} else if theme == "dark" {
+				resolved = "dark"
+			} else {
+				resolved = "light"
+			}
+			return theme, resolved
+		}
+	}
+
+	// 3. Fallback for raw string literals like `"dark"` or `dark`
+	clean := strings.ToLower(strings.Trim(s, "\" \t\r\n"))
+	switch clean {
+	case "dark":
+		return "dark", "dark"
+	case "white":
+		return "white", "white"
+	case "light":
+		return "light", "light"
+	case "auto":
+		return "auto", "light"
+	}
+
+	return theme, resolved
+}