[web_server] Add legacy_id to SSE events for third-party integration compatibility

esphome/components/web_server/web_server.cpp

@@ -533,6 +533,17 @@ static void set_json_id(JsonObject &root, EntityBase *obj, const char *prefix, J
 
   root[ESPHOME_F("id")] = id_buf;
 
+  // Add legacy_id for backward compatibility with third-party integrations
+  // Old format: {prefix}-{object_id} (e.g., "cover-garage_door")
+  // Remove before 2026.7.0 when object_id support is fully removed
+  char legacy_buf[ESPHOME_DOMAIN_MAX_LEN + 1 + OBJECT_ID_MAX_LEN];
+  char *lp = legacy_buf;
+  memcpy(lp, prefix, prefix_len);
+  lp += prefix_len;
+  *lp++ = '-';
+  obj->write_object_id_to(lp, sizeof(legacy_buf) - (lp - legacy_buf));
+  root[ESPHOME_F("legacy_id")] = legacy_buf;
+
   if (start_config == DETAIL_ALL) {
     root[ESPHOME_F("domain")] = prefix;
     root[ESPHOME_F("name")] = name;

esphome/components/wifi/wifi_component.cpp

@@ -746,32 +746,16 @@ void WiFiComponent::setup_ap_config_() {
     return;
 
   if (this->ap_.get_ssid().empty()) {
-    // Build AP SSID from app name without heap allocation
-    // WiFi SSID max is 32 bytes, with MAC suffix we keep first 25 + last 7
-    static constexpr size_t AP_SSID_MAX_LEN = 32;
-    static constexpr size_t AP_SSID_PREFIX_LEN = 25;
-    static constexpr size_t AP_SSID_SUFFIX_LEN = 7;
-
-    const std::string &app_name = App.get_name();
-    const char *name_ptr = app_name.c_str();
-    size_t name_len = app_name.length();
-
-    if (name_len <= AP_SSID_MAX_LEN) {
-      // Name fits, use directly
-      this->ap_.set_ssid(name_ptr);
-    } else {
-      // Name too long, need to truncate into stack buffer
-      char ssid_buf[AP_SSID_MAX_LEN + 1];
+    std::string name = App.get_name();
+    if (name.length() > 32) {
       if (App.is_name_add_mac_suffix_enabled()) {
         // Keep first 25 chars and last 7 chars (MAC suffix), remove middle
-        memcpy(ssid_buf, name_ptr, AP_SSID_PREFIX_LEN);
-        memcpy(ssid_buf + AP_SSID_PREFIX_LEN, name_ptr + name_len - AP_SSID_SUFFIX_LEN, AP_SSID_SUFFIX_LEN);
+        name.erase(25, name.length() - 32);
       } else {
-        memcpy(ssid_buf, name_ptr, AP_SSID_MAX_LEN);
+        name.resize(32);
       }
-      ssid_buf[AP_SSID_MAX_LEN] = '\0';
-      this->ap_.set_ssid(ssid_buf);
     }
+    this->ap_.set_ssid(name);
   }
   this->ap_setup_ = this->wifi_start_ap_(this->ap_);