fix(firmware): fix ESP32-C3 bootloop — NULL queue guard + correct SPI typedef

Two bugs causing immediate crash on first flash:
1. `Ws2801Spi2MhzMethod` typedef was wrong (had "Neo" prefix that doesn't exist
   in NeoPixelBus 2.8.x), causing compile error
2. `animTickTask` called `xQueueReceive(commandQueue, ...)` before UDP server
   initializes the queue — NULL pointer triggers configASSERT → panic → ~3s
   reboot loop. Added NULL guard so animation ticks safely until WiFi connects.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

firmware/src/animation_engine.cpp

@@ -117,11 +117,17 @@ static void animTickTask(void* pvParams) {
     TickType_t lastWake = xTaskGetTickCount();
 
     while (true) {
-        // Drain commandQueue — process ALL pending commands before this frame
+        // Drain commandQueue — process ALL pending commands before this frame.
+        // Guard against NULL: commandQueue is only created in startUdpServer(),
+        // which is called only after WiFi connects. If WiFi never connects (e.g.
+        // wrong credentials, no AP) commandQueue stays NULL and xQueueReceive()
+        // would panic. Skip queue drain safely until UDP server is up.
         LedCommand cmd;
+        if (commandQueue != NULL) {
             while (xQueueReceive(commandQueue, &cmd, 0) == pdTRUE) {
                 applyCommand(cmd);
             }
+        }
 
         // Tick Schrank (WS2801, RGB, 160 LEDs, isRGBW=false)
         if (zoneSchrank.active && zoneSchrank.currentAnim) {

firmware/src/led_driver.h

@@ -3,9 +3,12 @@
 #include "config.h"
 
 // SK6812: RGBW (4 bytes/LED) — MUST use NeoGrbwFeature, never NeoRgbFeature
+// NeoEsp32RmtNWs2812xMethod uses RMT channel N (0-indexed).
+// On ESP32-C3 (RISC-V single-core), only RMT channels 0 and 1 are available.
+// NeoEsp32Rmt0Ws2812xMethod = channel 0, pinned to PIN_SK6812 at runtime.
 using StripWand    = NeoPixelBus<NeoGrbwFeature, NeoEsp32Rmt0Ws2812xMethod>;
 // WS2801: RGB (3 bytes/LED), 2MHz SPI for cable-safe 5m run
-using StripSchrank = NeoPixelBus<NeoRgbFeature, NeoWs2801Spi2MhzMethod>;
+using StripSchrank = NeoPixelBus<NeoRgbFeature, Ws2801Spi2MhzMethod>;
 
 extern StripWand    stripWand;
 extern StripSchrank stripSchrank;