[core] Address review: fix docstrings per Copilot feedback

- get_app_state(): say 'STATUS_LED_* only', not 'STATUS_LED_* and lifecycle'
  since lifecycle bits are no longer maintained in app_state_.
- STATUS_LED_SETTLE_S: remove incorrect mention of feed_wdt re-dispatch;
  status_led_light is driven by the main loop, not feed_wdt.
- snapshot_led service: say 'status_led_light output' not 'pin state'
  since the fixture uses a template output, not GPIO.

esphome/core/application.h

@@ -262,7 +262,7 @@ class Application {
    */
   void teardown_components(uint32_t timeout_ms);
 
-  /// Return the public app state bits (STATUS_LED_* and lifecycle).
+  /// Return the public app state status bits (STATUS_LED_* only).
   /// Internal bookkeeping bits like APP_STATE_SETUP_COMPLETE are masked
   /// out so external readers (status_led components, etc.) never see them.
   uint8_t get_app_state() const { return this->app_state_ & ~APP_STATE_SETUP_COMPLETE; }

tests/integration/fixtures/status_flags.yaml

@@ -52,7 +52,7 @@ api:
         - component.update: app_warning_bit
         - component.update: app_error_bit
 
-    # Snapshot of the status_led's written pin state for observation.
+    # Snapshot of the status_led_light's output state for observation.
     - action: snapshot_led
       then:
         - component.update: status_led_writes

tests/integration/test_status_flags.py

@@ -22,10 +22,9 @@ import pytest
 from .state_utils import InitialStateHelper, SensorTracker, build_key_to_entity_mapping
 from .types import APIClientConnectedFactory, RunCompiledFunction
 
-# Time to let the main loop run so status_led_light writes to its output.
-# feed_wdt re-dispatches every ~3 ms; 300 ms gives ~100 opportunities and
-# is long enough that even a slow host-mode main loop produces measurable
-# write-count changes.
+# Time to let the host-mode main loop run so status_led_light.loop() can
+# execute enough iterations to produce measurable write-count changes on
+# the fake template output. 300 ms is well above the minimum needed.
 STATUS_LED_SETTLE_S = 0.3