Implement Phase 7C local status dashboard

Add fixed status icons, OLED dimming and wake behavior, lowercase
glyphs, and access-point metadata tracking. Update validation guidance,
roadmap status, and provide an icon layout mockup with licensing.

src/wifi_manager.h

@@ -60,6 +60,8 @@ typedef struct {
 
     wifi_config_ap_policy_t ap_policy;
     bool ap_running;
+    uint8_t ap_ssid_len;
+    char ap_ssid[WIFI_CONFIG_SSID_MAX_LEN + 1U];
     uint8_t ap_client_count;
     uint8_t ap_channel;