Enhance API and frontend components for character management and map visibility

- Updated API documentation to include `ownedByMe` field in character responses, indicating if a character was last updated by the current user's tokens.
- Modified MapView component to track and display the live status based on user-owned characters.
- Enhanced map data handling to exclude hidden maps for non-admin users and improved character icon representation on the map.
- Refactored character data structures to support new properties and ensure accurate rendering in the frontend.

frontend-nuxt/types/api.ts

@@ -28,6 +28,8 @@ export interface MapInfo {
   ID: number
   Name: string
   size?: number
+  /** Present when returned by API (e.g. for admins); client should exclude Hidden maps from selectors. */
+  Hidden?: boolean
 }
 
 export interface Character {
@@ -36,6 +38,8 @@ export interface Character {
   map: number
   position: { x: number; y: number }
   type: string
+  /** True when this character was last updated by one of the current user's tokens. */
+  ownedByMe?: boolean
 }
 
 export interface Marker {