Fit this lamp: 4 alarms, full data model, knock snooze, server use

Decode DP127 as 48 bytes (4 alarms), plus DP128, DP107 and DP126, from Tuya's
data model. Add day switches, alarm and sunset controls, a knock sensor on PA18,
display schedule, bedtime fade, radio timer and grouped web UI. Pin LibreTiny
v1.14.0 for the OTA restart fix. Ship the patched UART as an external component
so a server needs only a short YAML.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

components/uart/uart_component.cpp

@@ -0,0 +1,30 @@
+#include "uart_component.h"
+
+namespace esphome::uart {
+
+static const char *const TAG = "uart";
+
+bool UARTComponent::check_read_timeout_(size_t len) {
+  if (this->available() >= len)
+    return true;
+
+  uint32_t start_time = millis();
+  while (this->available() < len) {
+    if (millis() - start_time > 100) {
+      ESP_LOGE(TAG, "Reading from UART timed out at byte %zu!", this->available());
+      return false;
+    }
+    yield();
+  }
+  return true;
+}
+
+void UARTComponent::set_rx_full_threshold_ms(uint8_t time) {
+  uint8_t bytelength = this->data_bits_ + this->stop_bits_ + 1;
+  if (this->parity_ != UARTParityOptions::UART_CONFIG_PARITY_NONE)
+    bytelength += 1;
+  int32_t val = clamp<int32_t>((this->baud_rate_ / (bytelength * 1000 / time)) - 1, 1, 120);
+  this->set_rx_full_threshold(val);
+}
+
+}  // namespace esphome::uart