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.

internal/app/handlers/client.go

@@ -1,6 +1,7 @@
 package handlers
 
 import (
+	"context"
 	"encoding/json"
 	"io"
 	"log/slog"
@@ -26,7 +27,8 @@ func (h *Handlers) ClientRouter(rw http.ResponseWriter, req *http.Request) {
 		rw.WriteHeader(http.StatusUnauthorized)
 		return
 	}
-	_ = username
+	ctx = context.WithValue(ctx, app.ClientUsernameKey, username)
+	req = req.WithContext(ctx)
 
 	switch matches[2] {
 	case "locate":

internal/app/handlers/map.go

@@ -2,6 +2,7 @@ package handlers
 
 import (
 	"net/http"
+	"time"
 
 	"github.com/andyleap/hnh-map/internal/app"
 )
@@ -22,6 +23,17 @@ func (h *Handlers) APIConfig(rw http.ResponseWriter, req *http.Request) {
 	JSON(rw, http.StatusOK, config)
 }
 
+// CharacterResponse is the API shape for a character, including ownedByMe for the current session.
+type CharacterResponse struct {
+	Name      string        `json:"name"`
+	ID        int           `json:"id"`
+	Map       int           `json:"map"`
+	Position  app.Position  `json:"position"`
+	Type      string        `json:"type"`
+	Updated   time.Time     `json:"updated,omitempty"`
+	OwnedByMe bool          `json:"ownedByMe"`
+}
+
 // APIGetChars handles GET /map/api/v1/characters.
 func (h *Handlers) APIGetChars(rw http.ResponseWriter, req *http.Request) {
 	ctx := req.Context()
@@ -35,7 +47,19 @@ func (h *Handlers) APIGetChars(rw http.ResponseWriter, req *http.Request) {
 		return
 	}
 	chars := h.Map.GetCharacters()
-	JSON(rw, http.StatusOK, chars)
+	out := make([]CharacterResponse, 0, len(chars))
+	for _, c := range chars {
+		out = append(out, CharacterResponse{
+			Name:      c.Name,
+			ID:        c.ID,
+			Map:       c.Map,
+			Position:  c.Position,
+			Type:      c.Type,
+			Updated:   c.Updated.UTC(),
+			OwnedByMe: c.Username == s.Username,
+		})
+	}
+	JSON(rw, http.StatusOK, out)
 }
 
 // APIGetMarkers handles GET /map/api/v1/markers.