[lvgl] Fix nested lambdas in automations unable to access parameters (#11583)

Co-authored-by: clydebarrow <2366188+clydebarrow@users.noreply.github.com>

tests/components/lvgl/common.yaml

@@ -52,6 +52,19 @@ number:
     widget: spinbox_id
     id: lvgl_spinbox_number
     name: LVGL Spinbox Number
+  - platform: template
+    id: test_brightness
+    name: "Test Brightness"
+    min_value: 0
+    max_value: 255
+    step: 1
+    optimistic: true
+    # Test lambda in automation accessing x parameter directly
+    # This is a real-world pattern from user configs
+    on_value:
+      - lambda: !lambda |-
+          // Direct use of x parameter in automation
+          ESP_LOGD("test", "Brightness: %.0f", x);
 
 light:
   - platform: lvgl
@@ -110,3 +123,21 @@ text:
     platform: lvgl
     widget: hello_label
     mode: text
+
+text_sensor:
+  - platform: template
+    id: test_text_sensor
+    name: "Test Text Sensor"
+    # Test nested lambdas in LVGL actions can access automation parameters
+    on_value:
+      - lvgl.label.update:
+          id: hello_label
+          text: !lambda return x.c_str();
+      - lvgl.label.update:
+          id: hello_label
+          text: !lambda |-
+            // Test complex lambda with conditionals accessing x parameter
+            if (x == "*") {
+              return "WILDCARD";
+            }
+            return x.c_str();

tests/components/lvgl/lvgl-package.yaml

@@ -257,7 +257,30 @@ lvgl:
             text: "Hello shiny day"
             text_color: 0xFFFFFF
             align: bottom_mid
+        - label:
+            id: setup_lambda_label
+            # Test lambda in widget property during setup (LvContext)
+            # Should NOT receive lv_component parameter
+            text: !lambda |-
+              char buf[32];
+              snprintf(buf, sizeof(buf), "Setup: %d", 42);
+              return std::string(buf);
+            align: top_mid
             text_font: space16
+        - label:
+            id: chip_info_label
+            # Test complex setup lambda (real-world pattern)
+            # Should NOT receive lv_component parameter
+            text: !lambda |-
+              // Test conditional compilation and string formatting
+              char buf[64];
+              #ifdef USE_ESP_IDF
+              snprintf(buf, sizeof(buf), "IDF: v%d.%d", ESP_IDF_VERSION_MAJOR, ESP_IDF_VERSION_MINOR);
+              #else
+              snprintf(buf, sizeof(buf), "Arduino");
+              #endif
+              return std::string(buf);
+            align: top_left
         - obj:
             align: center
             arc_opa: COVER